Showing posts sorted by relevance for query adhd. Sort by date Show all posts
Showing posts sorted by relevance for query adhd. Sort by date Show all posts

Friday, November 01, 2013

Journal Alert - JOURNAL OF ATTENTION DISORDERS




Title:
Atomoxetine for Treating ADHD Symptoms in Autism: A Systematic Review

Authors:
Ghanizadeh, A

Source:
*JOURNAL OF ATTENTION DISORDERS*, 17 (8):635-640; NOV 2013

Abstract:
Objective: This study systematically reviews the current literature on
the administration of atomoxetine for treating children and adolescents
with comorbidity on autism spectrum disorder (ASD) and ADHD. Method:
PubMed/Medline and Google Scholar databases were electronically searched
to find the published trials on atomoxetine and ASD. Results: Six
articles reported the clinical trials of atomoxetine for treatment of
ADHD symptoms in patients with autism or pervasive development
disorders. Only one study that was placebo-controlled crossover pilot
trial reported that it is effective. Atomoxetine may be effective in
high-functioning patients with autism or patients with low severity.
Those with high severity of ASD may be more vulnerable to the adverse
effects of atomoxetine. Conclusion: There are not enough controlled
clinical trials for showing the efficacy of atomoxetine for treatment of
ADHD symptoms in autism. Although evidence suggests potential efficacy
of atomoxetine, the current evidences are not conclusive.

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*Pages: 641-654 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000325419400002
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Title:
Brain Cortical Thickness in ADHD: Age, Sex, and Clinical Correlations

Authors:
Montes, LGA; Alcantara, HP; Garcia, RBM; De La Torre, LB; Acosta, DA;
Duarte, MG

Source:
*JOURNAL OF ATTENTION DISORDERS*, 17 (8):641-654; NOV 2013

Abstract:
Objective: Longitudinal magnetic resonance imaging (MRI) studies have
shown reduced cortical thickness (CT) in individuals with ADHD, but this
abnormality disappears with age, suggesting developmental delay.
However, cross-sectional MRI studies have shown reduced CT, suggesting
abnormal development. The aim of this study was to compare whole-brain
CT in male and female children, adolescents, and adults with ADHD with
whole-brain CT in matched control participants. Method: MRI scans were
performed on ADHD and control participants. Results: CT data revealed
differences in right hemisphere (RH) only. Reduced CT was observed
predominantly in the frontoparietal region. However, increased CT was
observed predominantly in the occipital lobe. The CT differences were
correlated with severity of ADHD. Analysis of sex differences revealed
that location, number, and magnitude of CT differences were different
between males and females in each age group. Conclusion: These data
support the hypothesis that anatomical abnormalities in ADHD represent
abnormal development rather than developmental delay.

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*Pages: 655-659 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000325419400003
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Title:
Adolescent Outcome of Child ADHD in Primary Care Setting: Stability of Diagnosis

Authors:
Srebnicki, T; Kolakowski, A; Wolanczyk, T

Source:
*JOURNAL OF ATTENTION DISORDERS*, 17 (8):655-659; NOV 2013

Abstract:
Objective: The aim of the study was to assess the functioning of
patients with ADHD 6 to 7 years after the diagnosis. One objective was
to determine the stability of diagnosis, symptoms decline, subtype
change, remission, and change of diagnosis. Method: In all, 101
participants were chosen for testing. All were interviewed for the
presence of ADHD and social, academic, and peer functioning, and
completed Youth Self-Report. The caregivers completed a Wender Utah
Rating Scale and Child Behavior Checklist, and were asked to assess the
social, academic, and peer functioning of their offspring. Results: A
total of 56% (n = 57) still met the criteria for ADHD and 24.7% (n = 25)
still met the criteria for hyperkinetic disorder (HKD). Subtype
migration was observed. In all, 7.7% (n = 14) were rediagnosed with
Asperger's syndrome, 2.2% (n = 4) received a diagnosis of bipolar
disorder, 2.2% (n = 4) were diagnosed with mental retardation, 1 with
schizophrenia, and 1 with genetic disorder. Conclusion: The reliability
of diagnosis was high. The rates of all subtypes of ADHD decreased. More
measures need to be taken in terms of differential diagnosis of ADHD and
Asperger's Syndrome.

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*Pages: 660-669 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000325419400004
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Title:
Prediction of ADHD to Anxiety Disorders: An 11-Year National Insurance Data Analysis in Taiwan

Authors:
Tai, YM; Gau, CS; Gau, SSF; Chiu, HW

Source:
*JOURNAL OF ATTENTION DISORDERS*, 17 (8):660-669; NOV 2013

Abstract:
Objective: To prospectively investigate prediction of ADHD to anxiety
disorders (ANXs) in a national sample of Taiwan. Method: From the Taiwan
National Health Insurance Dataset (1997-2007), we collected 2,385 cases
of new diagnoses of ADHD from 1999 to 2003 and 9,540 sex-, age- and
index dates of the first diagnosis of ADHD-matched cohort controls
without ADHD. The outcome is age of the first diagnosis of ANXs until
December 31, 2007. Results: More cases of ADHD (17.7%) developed ANXs
than did matched controls (1.9%) with a younger age onset (12.7 years
vs. 17.9 years) and a shorter survival time (1.4 years vs. 5.0 years).
Cox models revealed a significant prediction of ADHD to ANXs controlling
for other psychiatric comorbidities [Hazard ratio (HR) = 15.83]. The
magnitude of such association was greater in males and decreased with
older age of first ADHD diagnosis. Conclusion: The findings imply that
early detection and treatment for ADHD may offset later development of
ANXs.

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*Pages: 670-680 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000325419400005
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Title:
The Direct Effects of Inattention and Hyperactivity/Impulsivity on Peer Problems and Mediating Roles of Prosocial and Conduct Problem Behaviors in a Community Sample of Children

Authors:
Andrade, BF; Tannock, R

Source:
*JOURNAL OF ATTENTION DISORDERS*, 17 (8):670-680; NOV 2013

Abstract:
Objective: This study tested whether children's symptoms of inattention
and hyperactivity/impulsivity were associated with peer problems and
whether these associations were mediated by conduct problems and
prosocial behaviors. Method: A community sample of 500 children,
including 245 boys and 255 girls, who ranged in age from 6 to 9 years (M
= 7.6, SD = 0.91) were recruited. Teachers' report of children's
inattention, hyperactivity/impulsivity, conduct problems, prosocial
behaviors, and peer problems was collected. Results: Symptoms of
inattention and hyperactivity/impulsivity were significantly positively
associated with peer problems. Conduct problems were associated with
more peer problems and prosocial behaviors with less peer problems.
Conduct problems and prosocial behaviors partially mediated the
association between hyperactivity/impulsivity and peer problems and
fully mediated the inattention-peer problems association. Conclusion:
Findings show that prosocial behaviors and conduct problems are
important variables that account for some of the negative impact of
symptoms of inattention and hyperactivity/impulsivity on peer
functioning.

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*Pages: 681-689 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000325419400006
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Title:
Sluggish Cognitive Tempo Among Young Adolescents With ADHD: Relations to Mental Health, Academic, and Social Functioning

Authors:
Becker, SP; Langberg, JM

Source:
*JOURNAL OF ATTENTION DISORDERS*, 17 (8):681-689; NOV 2013

Abstract:
Objective: This study investigated the role of sluggish cognitive tempo
(SCT) in relation to externalizing and internalizing mental health
problems, academic functioning, and social functioning among young
adolescents with attention-deficit/hyperactivity disorder (ADHD).
Method: In all, 57 youth ages 10 to 14 participated in the study.
Parents rated SCT, internalizing, and externalizing symptoms, as well as
social and academic impairment. Teachers rated academic and peer
impairment, and intelligence and academic achievement also were
assessed. Results: Above and beyond ADHD and conduct problem symptoms,
SCT was associated with internalizing mental health symptoms and social
problems. The association between SCT and externalizing problems or
academic functioning was not significant when accounting for ADHD
symptomatology and intelligence. Conclusion: SCT is consistently
associated with internalizing symptoms and is also associated with young
adolescents' general social difficulties. When controlling for important
related constructs, SCT is not associated with externalizing symptoms or
academic impairment among young adolescents with ADHD.

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*Pages: 690-698 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000325419400007
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Title:
German Validation of the Conners Adult ADHD Rating Scale-Self-Report: Confirmation of Factor Structure in a Large Sample of Participants With ADHD

Authors:
Christiansen, H; Hirsch, O; Philipsen, A; Oades, RD; Matthies, S;
Hebebrand, J; Ueckermann, J; Abdel-Hamid, M; Kraemer, M; Wiltfang, J;
Graf, E; Colla, M; Sobanski, E; Alm, B; Rosler, M; Jacob, C; Jans, T;
Huss, M; Schimmelmann, BG; Kis, B

Source:
*JOURNAL OF ATTENTION DISORDERS*, 17 (8):690-698; NOV 2013

Abstract:
Objective: The Conners Adult ADHD Rating Scales (CAARS) assess symptoms
specific to adults that are frequently used and have been translated
into German. The current study tests the factor structure of the CAARS
in a large sample of German adults with ADHD and compares the means of
the CAARS subscales with those of healthy German controls. Method: CAARS
were completed by 466 participants with ADHD and 851 healthy control
participants. Confirmatory factor analysis was used to establish model
fit with the American original. Comparisons between participants with
ADHD and healthy controls and influences of gender, age, and degree of
education were analyzed. Results: Confirmatory factor analysis showed a
very good fit with the model for the American original. Differences
between ADHD participants and healthy controls on all Conners Adult ADHD
Rating Scales-Self-Report (CAARS-S) subscales were substantial and
significant. Conclusion: The factor structure of the original American
model was successfully replicated in this sample of adult German ADHD
participants.

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*Pages: 699-710 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000325419400008
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Title:
Comparison of Mother, Father, and Teacher Reports of ADHD Core Symptoms in a Sample of Child Psychiatric Outpatients

Authors:
Sollie, H; Larsson, B; Morch, WT

Source:
*JOURNAL OF ATTENTION DISORDERS*, 17 (8):699-710; NOV 2013

Abstract:
Objective: To explore the significance of adding father ratings to
mother and teacher ratings in the assessment of ADHD symptoms in
children. Method: The ADHD Rating Scale-IV, the Child Behavior
Checklist, and the Teacher Report Form were filled out by all three
informants for a sample of 48 clinically referred children (79% boys)
aged 6 to 15 (M = 10.1) years. Results: Correspondence between father
and teacher reports on ADHD-specific symptoms (intraclass correlation
coefficient [ICC] = .38) exceeded that between mothers and teachers (ICC
= .23). Fathers rated their children as having fewer problems than did
mothers and teachers on Total scale scores and the Inattention subscale
of the ADHD Rating Scale-IV. Mother ratings were more sensitive to an
ADHD diagnosis, whereas father ratings better predicted an ADHD
diagnosis requiring the two-setting criterion. Conclusion: The choice of
parent informant and informant combination had a considerable impact on
parent-teacher concordance and estimates of ADHD symptoms and subtypes
in the child.

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*Pages: 711-721 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000325419400009
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Title:
Training Executive, Attention, and Motor Skills: A Proof-of-Concept Study in Preschool Children With ADHD

Authors:
Halperin, JM; Marks, DJ; Bedard, ACV; Chacko, A; Curchack, JT; Yoon, CA;
Healey, DM

Source:
*JOURNAL OF ATTENTION DISORDERS*, 17 (8):711-721; NOV 2013

Abstract:
Objective: To examine whether cognitive enhancement can be delivered
through play to preschoolers with ADHD and whether it would affect
severity of ADHD symptoms. Method: Twenty-nine 4- and 5-year-old
children and their parents participated in separate group sessions (3-5
children/group). Child groups were introduced games designed to enhance
inhibitory control, working memory, attention, visuospatial abilities,
planning, and motor skills. Parent groups were encouraged playing these
games with their children at least 30 to 45 min/day and taught
strategies for scaffolding difficulty levels and dealing with obstacles
to daily playing. Results: Parent ratings and session attendance
indicated considerable satisfaction with the program. Parent (p < .001)
and teacher (p = .003) ratings on the ADHD-Rating Scale-IV (ADHD-RS-IV)
indicated significant improvement in ADHD severity from pre- to
post-treatment, which persisted 3 months later. Conclusion: This
play-based intervention for preschoolers with ADHD is readily
implemented at home. Preliminary evidence suggests efficacy beyond the
termination of active treatment.

========================================================================



--
*************************************************************
Kevin S. McGrew, PhD
Educational Psychologist
Director, Institute for Applied Psychometrics (IAP)
Purpose, Passion & Serendipity
**************************************************************

Thursday, January 31, 2013

Journal Alert - JOURNAL OF ATTENTION DISORDERS

> LTitle:
> An Examination of Prescription Stimulant Misuse and Psychological Variables Among Sorority and Fraternity College Populations
>
> Authors:
> Dussault, CL; Weyandt, LL
>
> Source:
> *JOURNAL OF ATTENTION DISORDERS*, 17 (2):87-97; FEB 2013
>
> Abstract:
> Objective: The objective of this study was to examine nonmedical
> stimulant use among fraternity/sorority members and nonmembers and
> whether psychological variables (e.g., internal restlessness,
> depression, anxiety, and stress) were related to nonmedical stimulant
> use. Method: The sample consisted of 1,033 undergraduate students from
> five universities located in the northeastern, southeastern,
> northwestern, southwestern, and midwestern regions of the United States.
> Results: The findings revealed that fraternity and sorority members
> reported a higher rate of nonmedical stimulant use than nonmembers. In
> addition, regression analyses revealed that higher ratings of anxiety,
> stress, internal impulsivity, and internal restlessness significantly
> predicted nonmedical stimulant use. Conclusion: Current findings support
> further examination of nonmedical stimulant use among other college
> student subpopulations (i.e., athletic teams, honor societies, residence
> halls). In addition, there is a strong need to develop research-based
> intervention and preventive measures that target college populations
> identified as being at risk for nonmedical stimulant use. (J. of Att.
> Dis. 2013; 17(2) 87-97)
>
> ========================================================================
>
>
> *Pages: 98-101 (Review)
> *View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000313266700002
> *Order Full Text [ ]
>
> Title:
> Are Some Individuals Diagnosed With ADHD Prone to Alcohol Abuse?: Consideration of Two Possible Mediating Factors for This Susceptibility
>
> Authors:
> Maxwell, A
>
> Source:
> *JOURNAL OF ATTENTION DISORDERS*, 17 (2):98-101; FEB 2013
>
> Abstract:
> Some studies conducted on ADHD have found a statistically significant
> relationship between those diagnosed with the disorder and a higher
> susceptibility to abuse alcohol. However, other studies have found no
> such correlation, or have found this to be true of only a
> nonstatistically significant subset of the population of individuals
> with ADHD. This research found an answer to what may be causing these
> discrepancies in findings. Various studies on ADHD have discovered both
> biological and cognitive differences in some individuals with ADHD that
> may be responsible for this predisposition toward alcohol abuse found in
> a subset of the ADHD population. It is proposed that those individuals
> diagnosed with ADHD who also have a mutation in the dopamine receptor D4
> (DRD4) and who possess a deficiency in functionality of the prefrontal
> area of the brain designed for planning and reasoning may be more likely
> to develop alcohol abuse. (J. of Att. Dis. 2013; 17(2) 98-101)
>
> ========================================================================
>
>
> *Pages: 102-113 (Article)
> *View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000313266700003
> *Order Full Text [ ]
>
> Title:
> Oppositional Defiant Disorder in Adults With ADHD
>
> Authors:
> Reimherr, FW; Marchant, BK; Olsen, JL; Wender, PH; Robison, RJ
>
> Source:
> *JOURNAL OF ATTENTION DISORDERS*, 17 (2):102-113; FEB 2013
>
> Abstract:
> Objective: Oppositional defiant disorder (ODD) is the most common
> comorbid condition in childhood ADHD. This trial was prospectively
> designed to explore ODD symptoms in ADHD adults. Method: A total of 86
> patients in this placebo-controlled, double-blind trial of
> methylphenidate transdermal system (MTS) were categorized based on the
> presence of ODD symptoms in childhood and adulthood, and then were
> compared for baseline and outcome differences. Results: In all, 42% met
> Diagnostic and Statistical Manual of Mental Disorders (4th ed.; DSM-IV)
> criteria for ODD as adults and were significantly more impaired on
> measures of ADHD, personality disorder, and substance abuse and 27% had
> childhood ODD that had resolved. Childhood and adult ODD symptoms were
> significantly correlated. ODD and ADHD symptoms improved significantly
> with MTS (p < .001), and the most consistently significant results were
> found in participants with adult ODD. Conclusion: A total of 69% met
> criteria for ODD as children and/or adults. Understanding how ODD
> interacts with ADHD to impact personality disorder, substance abuse, and
> treatment response has important clinical, social, and theoretical
> implications. (J. of Att. Dis. 2013; 17(2) 102-113)
>
> ========================================================================
>
>
> *Pages: 114-127 (Article)
> *View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000313266700004
> *Order Full Text [ ]
>
> Title:
> Conceptual Structure of the Symptoms of Adult ADHD According to the DSM-IV and Retrospective Wender-Utah Criteria
>
> Authors:
> Glockner-Rist, A; Pedersen, A; Rist, F
>
> Source:
> *JOURNAL OF ATTENTION DISORDERS*, 17 (2):114-127; FEB 2013
>
> Abstract:
> Objective: Adult Diagnostic and Statistical Manual of Mental Disorders
> (4th ed.; DSM-IV) and retrospective childhood Wender-Utah ADHD criteria
> are implemented in self-report measures to assess adult ADHD and its
> required onset in childhood. Yet their dimensional structure and
> relationship to adult ADHD depressivity is still at debate. Therefore,
> both aspects were investigated, applying two respective German
> instruments (ADHD-Self-Report [ADHD-SR] and Wender Utah Rating
> Scale-German [WURS-G]) to two student samples. Method: ADHD-SR and
> WURS-G dimensions were identified by nonlinear confirmatory factor
> analyses, and their interrelations and relationship with adult
> depressivity were identified by structural equation modeling. Results:
> Adult ADHD-SR symptoms were organized into inattention, hyperactivity,
> and impulsivity, and WURS-G symptoms were organized into
> inattention/hyperactivity, affect lability, depressivity, and conduct
> problems. Yet only the first two WURS factors directly affected adult
> ADHD facets, though childhood depressivity influenced them indirectly
> via adult depressivity. Conclusion: Only criteria of the first two WURS
> factors can be considered valid childhood ADHD indicators. Thus, only
> they should be used as an aid in the retrospective assessment of ADHD
> symptoms. (J. of Att. Dis. 2013; 17(2) 114-127)
>
> ========================================================================
>
>
> *Pages: 128-140 (Article)
> *View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000313266700005
> *Order Full Text [ ]
>
> Title:
> Assessing ADHD in Latino Families: Evidence for Moving Beyond Symptomatology
>
> Authors:
> Gerdes, AC; Lawton, KE; Haack, LM; Hurtado, GD
>
> Source:
> *JOURNAL OF ATTENTION DISORDERS*, 17 (2):128-140; FEB 2013
>
> Abstract:
> Objective: In an effort to combat the mental health disparities that
> exist among Latinos, the current study aimed to add to our knowledge
> related to culturally appropriate assessments for Latino children
> presenting with ADHD. Method: As part of a larger study, a community
> sample of 68 Spanish-speaking, Latino parents completed the Spanish
> translation of the Disruptive Behavior Disorders Rating Scale (DBD-S), a
> commonly used, parent-report measure of ADHD. Results: Results suggest
> that although both the Inattentive and Hyperactive/Impulsive subscales
> of the DBD-S are psychometrically sound, the Hyperactive/Impulsive
> subscale may not be culturally appropriate with some Latino families,
> particularly those who are less acculturated. This was further supported
> by preliminary evidence suggesting that this subscale also was not
> diagnostically useful with the current, community sample. Conclusion:
> The potential problems associated with the overemphasis on
> symptomatology when working with Latino families, the importance of
> examining functional impairment as part of a culturally appropriate
> assessment, and the need to replicate the current findings with a
> clinical sample are discussed. (J. of Att. Dis. 2013; 17(2) 128-140)
>
> ========================================================================
>
>
> *Pages: 141-151 (Article)
> *View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000313266700006
> *Order Full Text [ ]
>
> Title:
> Exasperating or Exceptional? Parents' Interpretations of Their Child's ADHD Behavior
>
> Authors:
> Lench, HC; Levine, LJ; Whalen, CK
>
> Source:
> *JOURNAL OF ATTENTION DISORDERS*, 17 (2):141-151; FEB 2013
>
> Abstract:
> Objective: Attention Deficit/Hyperactivity Disorder (ADHD) is a commonly
> diagnosed childhood disorder associated with parent-child conflict and
> parental stress. This investigation explored whether parents'
> interpretation of symptomatic behavior predicted negative interactions
> with and perceptions of their child. Method: We recruited parents of
> 7-12 year old children who were diagnosed with ADHD (n = 41), were
> diagnosed with ADHD but whose parents construed symptomatic behavior
> positively (Indigo children; n = 36), and had no diagnosis (n = 26).
> Parents completed a questionnaire about their experiences with their
> child. Results: Relative to parents who used only the ADHD label for
> children's behavior, parents who also perceived symptomatic behavior as
> a sign of positive characteristics reported less frequent negative
> experiences with their child and less intense negative emotions during
> those experiences. They also viewed their children as more
> self-efficacious and as more likely to have a positive future.
> Conclusion: Positive perceptions of child symptomatic behavior appeared
> to buffer the impact of ADHD symptoms on parents and parent-child
> relationships. (J. of Att. Dis. 2013; 17(2) 141-151)
>
> ========================================================================
>
>
> *Pages: 152-162 (Article)
> *View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000313266700007
> *Order Full Text [ ]
>
> Title:
> The SWAN Captures Variance at the Negative and Positive Ends of the ADHD Symptom Dimension
>
> Authors:
> Arnett, AB; Pennington, BF; Friend, A; Willcutt, EG; Byrne, B;
> Samuelsson, S; Olson, RK
>
> Source:
> *JOURNAL OF ATTENTION DISORDERS*, 17 (2):152-162; FEB 2013
>
> Abstract:
> Objective: The Strengths and Weaknesses of ADHD Symptoms and Normal
> Behavior (SWAN) Rating Scale differs from previous parent reports of
> ADHD in that it was designed to also measure variability at the positive
> end of the symptom spectrum. Method: The psychometric properties of the
> SWAN were tested and compared with an established measure of ADHD, the
> Disruptive Behavior Rating Scale (DBRS). Results: The SWAN demonstrates
> comparable validity, reliability, and heritability to the DBRS.
> Furthermore, plots of the SWAN and DBRS reveal heteroscedasticity, which
> supports the SWAN as a preferred measure of positive attention and
> impulse regulation behaviors. Conclusion: The ability of the SWAN to
> measure additional variance at the adaptive end of the ADHD symptom
> dimensions makes it a promising tool for behavioral genetic studies of
> ADHD. (J. of Att. Dis. 2013; 17(2) 152-162)
>
> ========================================================================
>
>
> *Pages: 163-170 (Article)
> *View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000313266700008
> *Order Full Text [ ]
>
> Title:
> Self-Concept of College Students With ADHD: Discordance Between Self- and Parent-Reports
>
> Authors:
> Nelson, JM
>
> Source:
> *JOURNAL OF ATTENTION DISORDERS*, 17 (2):163-170; FEB 2013
>
> Abstract:
> Objective: To investigate the self-concept of college students with
> ADHD. Method: College students with ADHD and their parents completed
> self-report and observer-report measures of self-concept, respectively.
> Results: Results indicated that college students with ADHD did not
> report problems with self-concept but their parents did for them. This
> difference was statistically significant and large in magnitude (d =
> .84). Conclusion: Perceptions of the self-concept of college students
> with ADHD appear to vary by informant source. Hypotheses for the
> discordance between self- and parent-reports are discussed.
> Multi-informant assessment is recommended as a way to obtain a more
> complete clinical picture than reliance on self- or parent-report alone.
> (J. of Att. Dis. 2013; 17(2) 163-170)
>
> ========================================================================
>
>
> *Pages: 171-171 (Correction)
> *View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000313266700009
> *Order Full Text [ ]
>
> Title:
> Parental Functioning in Families of Children With ADHD: Evidence for Behavioral Parent Training and Importance of Clinically Meaningful Change (vol 16, pg 147, 2012)
>
> Authors:
> Gerdes, AC; Haack, LM; Schneider, BW
>
> Source:
> *JOURNAL OF ATTENTION DISORDERS*, 17 (2):171-171; FEB 2013
>
> Abstract:
> Gerdes, A. C., Haack, L. M., & Schneider, B. W. (2012). Parental
> Functioning in Families of Children With ADHD: Evidence for Behavioral
> Parent Training and Importance of Clinically Meaningful Change. Journal
> of Attention Disorders, 16, 147-156. (Original DOI:
> 10.1177/1087054710381482).
>

Tuesday, March 26, 2013

Misuse & Abuse of ADHD Meds among college students: Updated review of a growing concern [feedly]


 
 
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Misuse & Abuse of ADHD Meds among college students: Updated review of a growing concern

amphetamine-moleculeThe misuse and abuse of prescription medication is a growing concern. I remember speaking with colleagues 15–20 years ago as reports about the nonmedical use of stimulant medications used to treat ADHD (nonmedical use is defined as use by individuals without a prescription) were first appearing in the media. At the time, these were generally thought to be isolated incidents that were being over-dramatized in the press.

It has become clear, however, that this is not the case today and that the nonmedical use of ADHD meds, as well as misuse by individuals for whom medication is prescribed, is an important problem. Below is a brief overview and summary of research on these issues.

How common is nonmedical use of stimulant medications?

Between 2000 and 2011, the annual prevalence of nonmedical use of amphetamines — this includes drugs used to treat ADHD but is not limited to ADHD medications — declined from 6.5% to 3.5% among 8th graders, from 11.7% to 6.6% among 10th graders, and from 10.5% to 8.2% among 12th graders. Among college students, however, the rate increased from 6.6% to 9.3%. For non-college adults ages 19–28, the rate also increased — from 5.4% to 7.2%. This data is from the Monitoring the Future Study, an annual survey of alcohol and drug used conducted with a nationally representative sample. You can find an overview results from the 2011 survey online Here (opens PDF).

These data may underestimate nonmedical use of ADHD stimulants because the MTF survey does not inquire about all widely prescribed medications and individuals using medications not mentioned may inadvertently fail to mention nonmedical use.

How frequently do individuals engage in nonmedical use?

Published research on the frequency of nonmedical use has focused on college students. Results obtained from a nationally representative data base of college students indicated 32% of nonmedical users had used only once in the prior year, 45% used 2–10 times, and 19% used 11 or more times 15. In a study of adults in the general population, 30% of nonmedical users reported using only 1–2 times per year while 70% reported using 3 or more times.

Although most individuals who use nonmedically do so through oral routes of administration only, reports of crushing and snorting are not uncommon. In fact, this was reported by nearly 20% of nonmedical users in one recently published study of college students.

Where do those without prescriptions get medication?

The vast majority of nonmedical users among college students obtain medication from a friend with a prescription. And, results from several studies indicate that students with prescriptions are commonly approached by peers asking for their meds. Research with middle school and high school students makes clear that younger students are also approached for their meds, although at what appears to be a lower rate than for college students.

Feigning ADHD to obtain medication is also a growing concern. Studies with college students suggest that many who self-refer for an ADHD evaluation exaggerate their symptoms, perhaps to obtian stimulant medication. In a study of non-college adults, 20% of those who used nonmedically reported that they had 'faked' ADHD to obtain a prescription from a physician.

What are the characteristics of nonmedical users of ADHD medication?

Reports in the popular press sometimes imply that taking ADHD medication without a prescription has become almost 'normal' behavior for college students, part of a 'work hard, play hard' lifestyle. Research does not support this view, however.

Multiple studies conducted with college populations indicate that compared to their peers, nonmedical users:

- have higher rates of drug and alcohol use.
– perform less well academically.
– are more concerned about their ability to succeed academically.
– report significantly greater problems with attention.

Higher rates of substance use has also been found among nonmedical users of ADHD medication in the general adult population.

Thus, rather than being normative behavior, it appears that many individuals engaging in nonmedical use also misuse other substances and/or feel that attention problems are undermining their ability to be successful.

What are the main motivations for nonmedical use of ADHD medications?

Most research on the motives for nonmedical use has been conducted with college students. Among students, the primary motivation for most nonmedical users is to enhance academic performance, especially the ability to concentrate/focus while studying. However, other motives are also reported by a significant minority of individuals, including using to 'get high'.

Less is known about motives for use outside of college populations. In one study using a nationally representative sample of adults, 40% of nonmedical users indicated that their primary motive was to 'be more productive'. Another 13% reported that their primary motive was to 'feel good or get high'.

What are the consequences of nonmedical use of ADHD medication?

The vast majority of college students who engage in nonmedical use to enhance their academic performance believe that it is helpful. In one study, 70% rated the overall impact of nonmedical use as being either 'positive' or 'very positive' and only 5% rated the overall impact as 'negative' or 'very negative'.

This is striking because there is no data on whether nonmedical use actually improves academic performance. One recent review concluded that "…the cognitive effects of stimulants on healthy adults cannot yet be characterized definitively…"

Furthermore, most work on this issue is conducted in lab settings and examines the impact of stimulant medication on research measures of cognitive performance. Whether taking stimulants to pull an 'all nighter' improves exam performance the next day is unknown. In fact, a plausible hypothesis is that students who delay studying because they expect stimulants to help them cram the night before would perform worse than if they prepared using a more reasonable schedule.

Adverse consequences

Side effects — Although most students in the study mentioned above reported overall positive effects of nonmedical use, adverse events were also frequently reported. These included sleep difficulties (reported by 72%), irritability (62%), dizziness and lightheadedness (35%), headaches (33%), stomachaches (33%), and sadness (25%).

In addition, roughly 5% believed that nonmedical use had contributed to their using other prescription drugs and illicit substances. Approximately 10% reported occasional worries about obtaining stimulant medication and about becoming dependent on it. Over 10% believed that they needed stimulants to perform their best academically. This does not seem like a useful cognition to have.

Abuse and dependence — The abuse potential of stimulants when used by individuals without ADHD has been documented in multiple studies, although this is reduced in longer-acting formulations. Although information on how often nonmedical use of ADHD stimulants meets criteria for stimulant abuse or stimulant dependence is limited, data from the 2002 National Survey on Drug Use and Health showed that nearly 5% of individuals reporting past-year use of ADHD medications met screening criteria for these disorders.

Adverse reactions — Between 2005 and 2010 the number of emergency department visits resulting from the nonmedical use of stimulant drugs nearly tripled, from 5,212 to 15,585. The number of emergency department visits linked to adverse reactions to prescribed ADHD stimulants nearly doubled, from 5,085 visits to 9,181 visits.

Thirty-seven percent of all emergency department visits related to stimulant medication involved stimulant medications exclusively; the remainder involved use in combination with other drugs – frequently other pharmaceuticals — and alcohol.

What about the misuse and diversion of prescribed medication?

The misuse of stimulant medication by those with a prescription is also a concern.

Although most individuals use their prescribed stimulant medication appropriately, use in ways that deviate from those intended by the prescribing clinician is not uncommon. This generally takes the form of taking medication at higher doses or more frequently than prescribed, which has been reported by between 27% and 36% of college students across several studies. However, up to 25% of college students have reported using prescribed ADHD medication to get high and up to 30% have reported using in conjunction with alcohol and/or other drugs.

Similar to what has been found for nonmedical users, academic enhancement was the most frequently reported motive and most college students misusing for this purpose felt that it was helpful. Nonacademic reasons for misuse, e.g., to feel better or to lose weight, were reported as frequent reasons for misuse by relatively few students. Data on motives for misusing prescribed medication outside of college samples is limited.

As noted above, diversion of prescribed stimulant medication is a significant problem. In studies of college students, giving away or selling medication to peers has been reported by 26% in the previous 6 months, 35% in the previous 12 months, and 62% in their lifetime. Diversion of prescribed stimulants – generally to friends and relatives – was also reported by a significant minority of non-college adults.

Conclusions

Concerns about the nonmedical use of stimulant drugs used to treat ADHD are warranted, with nearly 10% of college students reporting this is a recent national survey; in some studies, the rates are far higher.

Although relatively infrequent use is most common, perhaps 20% of nonmedical users do so regularly and engage in intranasal routes of administration. Roughly 5% of nonmedical users may meet criteria for stimulant abuse or stimulant dependence and emergency department visits associated with nonmedical use are increasing.

In addition to nonmedical use, many individuals with prescriptions for ADHD medication occasionally misuse their medication by taking it in higher doses or with greater frequency than prescribed; some also use intranasally to 'get high' and/or in conjunction with other drugs or alcohol. As with nonmedical use, this is associated with higher rates of other substance use. Diverting medication to friends and family members is not uncommon and many are approached to do so, placing them at repeated risk for engaging in illegal behavior.

To address these issues, physicians should instruct patients about the abuse potential of their medication, the need to store it in a secure location, and obtain a commitment not to divert it. Children and adolescents may need coaching on how to respond if approached by peers seeking their medication.

Colleges should consider revising their conduct policies to address the misuse and diversion of ADHD medication, provide students with secure storage places, and educate students about the potential dangers associated with nonmedical use, especially when used with alcohol and other substances.

Pic courtesy of: BigStockPhoto

David Rabiner Attention Research Update– Dr. David Rabiner is a child clin­i­cal psy­chol­o­gist and Direc­tor of Under­grad­u­ate Stud­ies in the Depart­ment of Psy­chol­ogy and Neu­ro­science at Duke Uni­ver­sity. His research focuses on var­i­ous issues related to ADHD, the impact of atten­tion prob­lems on aca­d­e­mic achieve­ment, and atten­tion train­ing. He also pub­lishes Atten­tion Research Update, a com­pli­men­tary online newslet­ter that helps par­ents, pro­fes­sion­als, and edu­ca­tors keep up with the lat­est research on ADHD.

References — Information provided above is drawn from the following sources among others.

  • Arria AM, Garnier-Dykstra, KM, Caldeira, KM, et al.: Persistent nonmedical use of prescription stimulants among college students: Possible association with ADHD symptoms. J Atten Disord 2011, 15:347–356.
  • Dupont RL, Coleman JJ, Bucher RH, Wilford BB. (2008). Characteristics and motives of college students who engage in nonmedical use of methylphenidate. The American Journal on Addictions 2008, 17:167–171.
  • Garnier-Dykstra LM, Caldeira, KM, Vincent, KB, et al.: Nonmedical use of prescription stimulants during college: Four year trends in exposure opportunity, use, motives, and sources. J Am College Health 2012, 60:226–234. One of the few longitudinal studies of nonmedical use of stimulants.
  • Johnston LD, O-Malley PM, Bachman, JG, et al.: Monitoring the Future national survey results on drug use, 1975–2011: Volume II, College students and adults ages 19–50. Ann Arbor: Institute for Social Research, The University of Michigan. Includes recent national data on nonmedical use of stimulant medications.
  • McCabe SE, Teter, CJ. Drug use related problems among nonmedical users of prescription stimulants: a web-based survey of college students from a Midwestern university. Drug Alcohol Depen 2007, 91:69–76.
  • Novak SP, Kroutil LA, Williams RL, Van Brunt DL. The nonmedical use of prescription ADHD medications: Results from a national Internet panel. Substance Abuse Treatment, Prevention, and Policy 2007, 2:32.
  • Peterkin, AL, Crone CC, Sheridan MJ, Wise, TN (2010). Cognitive performance enhancement: Misuse or self-treatment? J Atten Disord 2010, 15:263–268.
  • Rabiner, DL, Anastopoulus AD, Costello EJ et al.: Motives and Perceived Consequences of Nonmedical ADHD Medication Use by College Students: Are students treating themselves for attention problems? J Atten Disord 2009a, 13:259–270. Careful examination of motives for nonmedical use and association of nonmedical use with attention problems.
  • Rabiner DL, Anastopoulus AD, Costello, EJ et al.: The misuse and diversion of prescribed ADHD medications by college students. J Atten Disord 2009, 13:144–153.
  • Sepulveda DR, Thomas LM, McCabe, SE, et al.: Misuse of prescribed stimulant medication for ADHD and associated patterns of substance use: Preliminary analysis among college students. Journal of Pharmacy Practice 2011, 24:551–560.
  • Sullivan, BK, May K, Galbally L. Symptom exaggeration by college adults in attention-deficit hyperactivity disorder and learning disorder assessments. Appl Neuropsychol 2007, 14:189–207.
  • Upadhyaya HP, Rose K, Wang W, Brady KT. Attention-deficit/hyperactivity disorder, medication treatment, and substance use patterns among adolescents and young adults. J Child Adolesc Psychopharmacol 2005, 15:799–809.




Tuesday, October 17, 2006

Is ADHD related to a poor internal mental clock?

I just ran across a 2004 study that examined prospective (reproducing a 30 second time interval) and retrospective (how long did a task take?) time judgements in children with reading disorders and ADHD (RD and ADHD groups).

Although prior research with ADHD subjects has implicated deficient mental/interval time-keeping (at the milisecond level--see introduction/review of lit in actual article--see below) as a potentail causal mechanism for ADHD, the current study attempted to determine if ADHD subjects, consistent with Barkley's ADHD impaired behavioral inhibition conceptualization (which articulates four primary self-regulation subsystems--working memory and sense of time, internalization of speech, affect regulation, and "reconstitution" or the formation of novel, complex behavioral sequences), differed from RD subjects in more "everday" time perception/judgments.

With regard to the focus of Tick Tock Talk: The IQ Brain Clock blog, the most interesting finding was a difference between RD and ADHD subjects in retrospective time estimation. As stated by the authors:
  • The most unusual and interesting finding of the study was discovering the retrospective exaggeration of ADHD children when judging how long the CCPT had taken. When asked “how long did that take?” of the CCPT, ADHD children gave more extreme estimates (“Oh! That took 3 hours!”). This finding underscores the temporal distortion problems found in ADHD (West et al., 2000). Childrens’ time estimations become less accurate with increasing duration of the time interval to be perceived, and distortion decreases with age (Zakay, 1992). Barkley’s theory emphasizes that ADHD childrens’ time judgements will be developmentally delayed relative to agemates.
  • McGee et al. (2004). Time Perception: Does it Distinguish ADHD and RD Children in a Clinical Sample? Journal of Abnormal Child Psychology, Vol. 32, No. 5, October 2004, pp. 481–490 (click here to view)

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Tuesday, May 08, 2012

Executive functions in girls with ADHD followed prospectively into young adulthood.

Neuropsychology - Vol 24, Iss 4
Objective: We prospectively followed an ethnically and socioeconomically diverse sample of girls with ADHD (n = 140) and a matched comparison group (n = 88) into young adulthood (Mage = 19.6), 10 years after childhood initial assessments, to evaluate neuropsychological functioning. We hypothesized that neuropsychological deficits would persist through young adulthood for those with ADHD, and that those with continuing ADHD symptomatology in young adulthood would show the largest impairments. Method: Neuropsychological measures at follow-up emphasized executive functions (EF) including planning, organization, inhibitory control, sustained attention, working memory, and set shifting. Results: Parallel to findings from childhood and adolescence, the girls with childhood-diagnosed ADHD displayed medium to large deficits in EF relative to comparisons at follow-up, even with statistical control of baseline demographic and comorbidity variables. The addition of IQ as a covariate attenuated differences but several remained significant. Comparisons between the inattentive and combined subtypes of ADHD yielded nonsignificant results with small effect sizes. EF impairments were evident in both participants whose ADHD diagnoses persisted and in those whose ADHD symptoms had remitted to a nondiagnosable level; both subgroups had more EF deficits than those who did not meet criteria for ADHD in either childhood or young adulthood. Conclusions: Those in both the persistent and remitted ADHD groups showed impairments in EF relative to comparisons and generally did not differ from each other. Overall, childhood ADHD in girls portends neuropsychological/EF deficits that persist for at least 10 years. (PsycINFO Database Record (c) 2012 APA, all rights reserved)
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Thursday, June 21, 2007

More on ADHD and poor internal mental clock

Another research study (Rommelse et al., 2007) suggesting a deficit in the internal brain clock may be associated with (diagnostic marker?) ADHD in children (click here for prior post). In particular, the ability to reproduce time intervals (time reproduction tasks) was found to be related to a potential diagnosis of ADHD in young children.

Once again...another study linking various mental functions and clinical disorders and the functioning of the internal brain clock...tick, tock, tick, tock......
  • Objective: Time reproduction is deficient in children with attention-deficit/hyperactivity disorder (ADHD). Whether this deficit is familial and could therefore serve as a candidate endophenotype has not been previously investigated. It is unknown whether timing deficits are also measurable in adolescent children with ADHD and nonaffected siblings. Method: These issues were investigated in 226 children with ADHD, 188 nonaffected siblings, and 162 normal controls ages 5 to 19. Children participated in a visual and auditory time reproduction task. They reproduced interval lengths of 4, 8, 12, 16, and 20 seconds. Results: Children with ADHD and their nonaffected siblings were less precise than controls, particularly when task difficulty was systematically increased. Time reproduction skills were familial. Time reproduction deficits were more pronounced in younger children with ADHD than in older children. Children with ADHD could be clearly dissociated from control children until the age of 9. After this age, group differences were somewhat attenuated, but were still present. Differences between nonaffected siblings and controls were constant across the age range studied. Deficits were unaffected by modality. Conclusions: Time reproduction may serve as a candidate endophenotype for ADHD, predominantly in younger children with (a genetic risk for) ADHD.

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Tuesday, January 29, 2013

Research Byte: Neuropsychological performance and attention-deficit hyperactivity disorder subtypes and symptom dim

Objective: Characterization of clinical heterogeneity in attention-deficit hyperactivity disorder (ADHD) remains controversial. Neuropsychological and cognitive studies provide one type of validation data, but too often have considered only a narrow range of functional domains. Method: The current study examined ADHD subtype and presentation differences across a broad range of neurocognitive domains in a large clinically characterized, community-recruited sample of 498 youth (213 control, 107 ADHD-primarily inattentive [ADHD-PI], 137 ADHD-combined [ADHD-C]), ages 6–17 years. Domains assessed included inhibition, working memory, arousal, processing speed, response variability, and temporal information processing. Results: Youth with ADHD-C performed worse than youth with ADHD-PI in all domains, consistent with a severity model. Performance among a subgroup with a "restrictive inattentive" presentation indicated potential deficits in processing speed relative to other ADHD-PI youth, but no other effects. When all measures were included in the same model, cognitive control (executive functions, working memory, and memory span), arousal, and response variability each provided uniquely incremental statistical prediction of specific symptom dimensions and of subtype/presentation, but temporal information processing and processing speed did not. Conclusion: Results suggest the potential to consolidate multiple neurocognitive theories of ADHD, and that such consolidation will apply across putative clinical subtypes or presentations. (PsycINFO Database Record (c) 2013 APA, all rights reserved)








Tuesday, May 10, 2016

Large multi-center study to test videogame-like digital therapy as (potentially) FDA-cleared ADHD treatment [feedly]



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Large multi-center study to test videogame-like digital therapy as (potentially) FDA-cleared ADHD treatment
// SharpBrains

evo_akiliAkili Labs recruits for ADHD trial with ambitions of FDA clearance for digital medicine (MedCity News)

"Akili Labs has kicked off open enrollment for a clinical trial of its Project EVO video game platform in a quest to secure for 510(k) clearance from the U.S. Food and Drug Administration for its lead indication — attention deficit hyperactivity disorder.

The trial is recruiting at least 300 participants aged 8-12 years old who have been diagnosed with ADHD. It will evaluate the safety and efficacy of the Project EVO platform, according to a company statement. The ultimate goal is to provide a drug alternative for children with ADHD and Akili Labs CEO Eddie Martucci views digital therapeutics as the way to do that…If the trial meets its endpoints, the company plans to submit Project EVO for FDA approval.

In a phone interview in February Martucci said, "We want this to stand alongside Adderall and other drugs as a doctor-prescribed treatment."

Study: Software Treatment for Actively Reducing Severity of ADHD (STARS-ADHD) (ClinicalTrials.gov)

  • Brief summary: The purpose of this study is to evaluate the effects of videogame-like digital therapies on attentional functioning and symptoms in children diagnosed with ADHD.
  • Description: The study will be a randomized, parallel group, controlled trial of two videogame-like (iPad-based) digital therapies. The study will consist of 3 primary phases: Screening, Washout/Baseline, and Treatment. During the Screening Phase (Day -28 to Day -7), participants will undergo screening to evaluate eligibility for the study. Screening may take place up to 28 days before the Baseline Visit (Day 0). For those children currently on medication for ADHD the Washout period will begin 7 days prior to Baseline where treatment will be discontinued. On Day 0, the Baseline visit will occur wherein additional eligibility criteria will be established. The Treatment Phase (Day 1 to Day 27) will involve using the digital therapy at home for each participant followed by an In-Clinic assessment on Day 28 to assess key outcomes. Compliance with treatment/use requirements will be monitored remotely during this phase.

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Thursday, March 07, 2013

Research Byte: Practitioner Review: Current best practice in the management of adverse events during treatment with ADHD medications in children and adolescents

Title:
Practitioner Review: Current best practice in the management of adverse events during treatment with ADHD medications in children and adolescents

Authors:
Cortese, S; Holtmann, M; Banaschewski, T; Buitelaar, J; Coghill, D;
Danckaerts, M; Dittmann, RW; Graham, J; Taylor, E; Sergeant, J

Source:
*JOURNAL OF CHILD PSYCHOLOGY AND PSYCHIATRY*, 54 (3):227-246; MAR 2013

Abstract:
Background: Medication is an important element of therapeutic strategies
for ADHD. While medications for ADHD are generally well-tolerated, there
are common, although less severe, as well as rare but severe adverse
events AEs during treatment with ADHD drugs. The aim of this review is
to provide evidence- and expert-based guidance concerning the management
of (AEs) with medications for ADHD. Methods: For ease of use by
practitioners and clinicians, the article is organized in a simple
question and answer format regarding the prevalence and management of
the most common AEs. Answers were based on empirical evidence from
studies (preferably meta-analyses or systematic reviews) retrieved in
PubMed, Ovid, EMBASE and Web of Knowledge through 30 June 2012. When no
empirical evidence was available, expert consensus of the members of the
European ADHD Guidelines Group is provided. The evidence-level of the
management recommendations was based on the SIGN grading system.
Results: The review covers monitoring and management strategies of loss
of appetite and growth delay, cardiovascular risks, sleep disturbance,
tics, substance misuse/abuse, seizures, suicidal thoughts/behaviours and
psychotic symptoms. Conclusion: Most AEs during treatment with drugs for
ADHD are manageable and most of the times it is not necessary to stop
medication, so that patients with ADHD may continue to benefit from the
effectiveness of pharmacological treatment.

Thursday, March 28, 2013

Journal Alert - NEUROPSYCHOLOGIA---issue on neural timing


Journal Name:   NEUROPSYCHOLOGIA (ISSN: 0028-3932)
Issue:          Vol. 51 No. 2, 2013
IDS#:           102JB
Alert Expires:  10 JAN 2014
Number of Articles in Issue:  18 (18 included in this e-mail)
Organization ID:  c4f3d919329a46768459d3e35b8102e6
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Note:  Instructions on how to purchase the full text of an article and Thomson Reuters Science Contact information are at the end of the e-mail.
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*Pages: 187-190 (Editorial Material)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800001
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Title:
The cognitive neuroscience of time perception: How psychological studies might help to dissect the timing system

Authors:
Wearden, JH

Source:
*NEUROPSYCHOLOGIA*, 51 (2):187-190; SI JAN 2013

Abstract:
It is argued that the cognitive neuroscience of time perception does not
make sufficient use of a range of experimental techniques and
theoretical approaches which might be useful in "dissecting" the human
timing system, and thus helping to uncover its neural basis. These
techniques are mostly inspired by scalar expectancy theory, but do not
depend on acceptance of that model. Most of the methods result in the
same physical stimuli giving rise to systematically different time
judgements, thus they avoid problems of control which have haunted some
areas of the cognitive neuroscience of timing. Among the possibilities
are (a) changing the basic duration judgement of stimuli and events, (b)
manipulating working memory and reference memories for duration, and (c)
changing temporal decision processes. (C) 2012 Published by Elsevier
Ltd.

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*Pages: 191-196 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800002
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Title:
The neural correlates of temporal judgments in the duration bisection task

Authors:
Lindbergh, CA; Kieffaber, PD

Source:
*NEUROPSYCHOLOGIA*, 51 (2):191-196; SI JAN 2013

Abstract:
Decision processes related to interval timing are commonly examined
using the duration bisection procedure-a well-established timekeeping
task in which participants make judgments about whether a series of
"probes" are closer in duration to a "short" anchor duration or a "long"
anchor duration. The specific information used during bisection
categorization has been a subject of debate. Recent research involving
the Contingent Negative Variation (CNV) suggests that the "short" anchor
duration and a value near the geometric mean (GM) of the short and long
anchors are among the critical pieces of information used during
bisection categorization judgements. The present study examined a
corollary of this claim, that memory comparison and decision-making
processes related to the temporal judgments are completed prior to probe
offset when probe durations are perceived to be "long;" testing the
hypotheses that (I) response times would be significantly longer for
"short" relative to "long" categorizations and that (2) there would be
significant differences in ERPs time-locked to probe offset between
probes judged to be "short" and "long." Both of these predictions were
realized in the results, providing strong support for the assertion that
a value near the GM-likely the point of subjective equality (PSE)-is
among the critical information used during bisection categorization
judgments.. (C) 2012 Elsevier Ltd. All rights reserved.

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*Pages: 197-210 (Article)
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Title:
Adaptive tuning of perceptual timing to whole body motion

Authors:
Binetti, N; Siegler, IA; Bueti, D; Doricchi, F

Source:
*NEUROPSYCHOLOGIA*, 51 (2):197-210; SI JAN 2013

Abstract:
In a previous work we have shown that sinusoidal whole-body rotations
producing continuous vestibular stimulation, affected the timing of
motor responses as assessed with a paced finger tapping (PFT) task
(Binetti et al. (2010). Neuropsychologia, 48(6), 1842-1852). Here, in
two new psychophysical experiments, one purely perceptual and one with
both sensory and motor components, we explored the relationship between
body motion/vestibular stimulation and perceived timing of acoustic
events. In experiment 1, participants were required to discriminate
sequences of acoustic tones endowed with different degrees of
acceleration or deceleration. In this experiment we found that a tone
sequence presented during acceleratory whole-body rotations required a
progressive increase in rate in order to be considered temporally
regular, consistent with the idea of an increase in "clock" frequency
and of an overestimation of time. In experiment 2 participants produced
self-paced taps, which entailed an acoustic feedback. We found that
tapping frequency in this task was affected by periodic motion by means
of anticipatory and congruent (in-phase) fluctuations irrespective of
the self-generated sensory feedback. On the other hand, synchronizing
taps to an external rhythm determined a completely opposite modulation
(delayed/counter-phase). Overall this study shows that body
displacements "remap" our metric of time, affecting not only motor
output but also sensory input. (C) 2012 Elsevier Ltd. All rights
reserved.

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*Pages: 211-219 (Article)
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Title:
Cognitive function predicts neural activity associated with pre-attentive temporal processing

Authors:
Foster, SM; Kisley, MA; Davis, HP; Diede, NT; Campbell, AM; Davalos, DB

Source:
*NEUROPSYCHOLOGIA*, 51 (2):211-219; SI JAN 2013

Abstract:
Temporal processing, or processing time-related information, appears to
play a significant role in. a variety of vital psychological functions.
One of the main confounds to assessing the neural underpinnings and
cognitive correlates of temporal processing is that behavioral measures
of timing are generally confounded by other supporting cognitive
processes, such as attention. Further, much theorizing in this field has
relied on findings from clinical populations (e.g., individuals with
schizophrenia) known to have temporal processing deficits. In this
study, we attempted to avoid these difficulties by comparing temporal
processing assessed by a pre-attentive event-related brain potential
(ERP) waveform, the mismatch negativity (MMN) elicited by time-based
stimulus features, to a number of cognitive functions within a
non-clinical sample. We studied healthy older adults (without dementia),
as this population inherently ensures more prominent variability in
cognitive function than a younger adult sample, allowing for the
detection of significant relationships between variables. Using
hierarchical regression analyses, we found that verbal memory and
executive functions (i.e., planning and conditional inhibition, but not
set-shifting) uniquely predicted variance in temporal processing beyond
that predicted by the demographic variables of age, gender, and hearing
loss. These findings are consistent with a frontotemporal model of MMN
waveform generation in response to changes in the temporal features of
auditory stimuli. (C) 2012 Elsevier Ltd. All rights reserved.

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*Pages: 220-234 (Article)
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Title:
Time perception in children: A neurodevelopmental approach

Authors:
Droit-Volet, S

Source:
*NEUROPSYCHOLOGIA*, 51 (2):220-234; SI JAN 2013

Abstract:
In this review, we discuss behavioral studies on time perception in
healthy children that suggest the existence of a primitive "sense" of
time in infants as well as research that has revealed the changes in
time judgments that occur throughout childhood. Moreover, a distinction
is made between implicit and explicit time judgments in order to take
account of the different types of temporal judgments that emerge across
ages. On the basis of both the neurobiological model of the internal
clock proposed by Matell and Meck (2000), and of results of imaging
studies in human adults, we then try to identify which of the neural
structures underlying this primitive sense of time mature faster and
which mature more slowly in order to explain the age-related variance in
time judgments. To this end, we also present the small number of timing
studies conducted among typically and non-typically developing children
that have used functional magnetic resonance imaging (fMRI) as well as
those that have assessed the cognitive capacities of such children on
the basis of various neuropsychological tests. (C) 2012 Elsevier Ltd.
All rights reserved.

========================================================================


*Pages: 235-266 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800006
*Order Full Text [ ]

Title:
Timing deficits in attention-deficit/hyperactivity disorder (ADHD): Evidence from neurocognitive and neuroimaging studies

Authors:
Noreika, V; Falter, CM; Rubia, K

Source:
*NEUROPSYCHOLOGIA*, 51 (2):235-266; SI JAN 2013

Abstract:
Relatively recently, neurocognitive and neuroimaging studies have
indicated that individuals with attention-deficit/hyperactivity disorder
(ADHD) may have deficits in a range of timing functions and their
underlying neural networks. Despite this evidence, timing deficits in
ADHD are still somewhat neglected in the literature and mostly omitted
from reviews on ADHD. There is therefore a lack of integrative reviews
on the up-to-date evidence on neurocognitive and neurofunctional
deficits of timing in ADHD and their significance with respect to other
behavioural and cognitive deficits. The present review provides a
synthetic overview of the evidence for neurocognitive and
neurofunctional deficits in ADHD in timing functions, and integrates
this evidence with the cognitive neuroscience literature of the neural
substrates of timing. The review demonstrates that ADHD patients are
consistently impaired in three major timing domains, in motor timing,
perceptual timing and temporal foresight, comprising several timeframes
spanning milliseconds, seconds, minutes and longer intervals up to
years. The most consistent impairments in ADHD are found in sensorimotor
synchronisation, duration discrimination, reproduction and delay
discounting. These neurocognitive findings of timing deficits in ADHD
are furthermore supported by functional neuroimaging studies that show
dysfunctions in the key inferior fronto-striato-cerebellar and
fronto-parietal networks that mediate the timing functions. Although
there is evidence that these timing functions are inter-correlated with
other executive functions that are well established to be impaired in
the disorder, in particular working memory, attention, and to a lesser
degree inhibitory control, the key timing deficits appear to survive
when these functions are controlled for, suggesting independent
cognitive deficits in the temporal domain. There is furthermore strong
evidence for an association between timing deficits and behavioural
measures of impulsiveness and inattention, suggesting that timing
problems are key to the clinical behavioural profile of ADHD. Emerging
evidence shows that the most common treatment of ADHD with the dopamine
agonist and psychostimulant Methylphenidate attenuates most timing
deficits in ADHD and normalises the abnormally blunted recruitment of
the underlying fronto-striato-cerebellar networks. Timing function
deficits in ADHD, therefore, next to executive function deficits, form
an independent impairment domain, and should receive more attention in
neuropsychological, neuroimaging, and pharmacological basic research as
well as in translational research aimed to develop pharmacological or
non-pharmacological treatment of abnormal timing behaviour and cognition
in ADHD. (C) 2012 Elsevier Ltd. All rights reserved.

========================================================================


*Pages: 267-274 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800007
*Order Full Text [ ]

Title:
Deciphering the impact of cerebellar and basal ganglia dysfunction in accuracy and variability of motor timing

Authors:
Claassen, DO; Jones, CRG; Yu, MH; Dirnberger, G; Malone, T; Parkinson,
M; Giunti, P; Kubovy, M; Jahanshahi, M

Source:
*NEUROPSYCHOLOGIA*, 51 (2):267-274; SI JAN 2013

Abstract:
Studies in motor timing have shown that the basal ganglia and cerebellum
play an important role in temporal processing. Timing studies in
Cerebellar/ataxic Disorders (CD) and Parkinson's disease (PD) patients
contrast the roles of the cerebellum and basal ganglia in motor timing.
Here, we used a synchronization-continuation task to compare accuracy
and variability of motor timing during repetitive tapping. We compared
data collected for the present study - from patients with CD and healthy
controls - to data from a previous study with patients with PD. We asked
participants to tap at Inter-stimulus Intervals (ISIs) of 250, 500,
1000, and 2000 ms. Using Linear Mixed Models (LMMs), we explored how
ISI, Task Phase, and Diagnosis interacted to determine the (i) the
accuracy and (ii) the variability of tapping. In our analysis of
accuracy, we found evidence that during the synchronization phase, at
ISI=250 ms, CD patients lagged 'behind the beat'; whereas our previous
work has suggested that medicated PD patients hasten 'ahead of the
beat'. In our analysis of variability, we observed that at ISIs below
1000 ms, CD patients showed greater variability in motor timing than the
healthy controls, while PD patients showed less variability than CD
patients and healthy controls during the synchronization phase at the
1000 ms ISI. These results highlight the differential performance on
explicit motor timing between patients with disorders of the cerebellum
and basal ganglia. Our results illustrate a novel approach to discerning
cognitive control of motor timing. (C) 2012 Elsevier Ltd. All rights
reserved.

========================================================================


*Pages: 275-283 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800008
*Order Full Text [ ]

Title:
How does one night of sleep deprivation affect the internal clock?

Authors:
Casini, L; Ramdani-Beauvir, C; Burle, B; Vidal, F

Source:
*NEUROPSYCHOLOGIA*, 51 (2):275-283; SI JAN 2013

Abstract:
Twelve subjects performed two temporal tasks, one explicit (Experiment
1) and one implicit (Experiment 2) after one night of sleep deprivation
and after one night of normal rest. Experiment 1 involved a 1100-ms
duration production task, and in Experiment 2 subjects performed a word
identification task requiring implicit estimation of vowel duration
(around 150 ms). One night of sleep deprivation had the same pattern of
effect on explicit timing in the suprasecond range and implicit timing
in the millisecond range. Specifically, sleep deprivation induced
productions of shorter intervals in the duration production task and
estimation of segmental durations as being longer in the word
identification task. Both results are consistent with an acceleration of
pacemaker rate.
Moreover, in both experiments, we found a correlation between the
alertness level of participants and the size of the effect. Therefore,
sleep deprivation, which physiologically manipulates cortical arousal
level, produced similar performance modulation in suprasecond explicit
and subsecond implicit tasks suggesting a common mechanism. (C) 2012
Elsevier Ltd. All rights reserved.

========================================================================


*Pages: 284-292 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800009
*Order Full Text [ ]

Title:
Differential effects of amphetamine and haloperidol on temporal reproduction: Dopaminergic regulation of attention and clock speed

Authors:
Lake, JI; Meck, WH

Source:
*NEUROPSYCHOLOGIA*, 51 (2):284-292; SI JAN 2013

Abstract:
Healthy volunteers were tested on 7-s and 17-s peak-interval timing
procedures following D-amphetamine (20 mg-oral), haloperidol (2
mg-oral), and placebo treatments in order to assess the dopaminergic
regulation of temporal processing. Individual differences were observed
in the drug effects such that two different patterns of timing behavior
emerged. In the first pattern, D-amphetamine produced proportional
leftward shifts of the timing functions while haloperidol produced
proportional rightward shifts. This symmetrical pattern of results
suggests that clock speed is regulated by the effective level of
dopamine, i.e., D-amphetamine increases clock speed and haloperidol
decreases clock speed. The second pattern was the opposite of the first
pattern and was revealed by D-amphetamine producing proportional
rightward shifts of the timing functions while haloperidol produced no
reliable effect. This asymmetrical pattern of results is consistent with
an explanation in which attention toward the stimulant-induced euphoria
produced by D-amphetamine diminishes the attentional resources available
for temporal processing, thereby diluting any drug-induced changes in
clock speed. The result of increased competition and time-sharing
between these two dimensions (e.g., attention towards feelings of
euphoria versus attention towards the passage of time) leads to the
underestimation/overproduction of temporal intervals. Interestingly,
participants that displayed the 'clock-speed' pattern liked
D-amphetamine significantly less than participants that displayed the
'attention' pattern and were more variable in a simple reaction time
task than other participants. These results suggest that individuals
with a higher degree of sensitivity to time are also more sensitive to
their feelings of stimulant-induced euphoria and drug liking-suggesting
that internal clock and reward pathways share common dopaminergic
pathways. (C) 2012 Elsevier Ltd. All rights reserved.

========================================================================


*Pages: 293-308 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800010
*Order Full Text [ ]

Title:
Epistasis effects of dopamine genes on interval timing and reward magnitude in humans

Authors:
Balci, F; Wiener, M; Cavdaroglu, B; Coslett, HB

Source:
*NEUROPSYCHOLOGIA*, 51 (2):293-308; SI JAN 2013

Abstract:
We tested human participants on a modified peak procedure in order to
investigate the relation between interval timing and reward processing,
and examine the interaction of this relation with three different
dopamine-related gene polymorphisms. These gene polymorphisms affected
the expression of catechol-o-methyltransferase, which catabolizes
synaptic dopamine primarily in the prefrontal cortex (COMT Val158Met
polymorphism), D2 dopamine receptors primarily in the striatum
(DRD2/ANKK1-Taq1a polymorphism), and dopamine transporters, which clear
synaptic dopamine in the striatum (DAT 3' VNTR variant). The inclusion
of these polymorphisms allowed us to investigate dissociable aspects of
the dopamine system and their interaction with reward magnitude
manipulations in shaping timed behavior. These genes were chosen for
their roles in reward processing and cortico-striatal information
processing that have been implicated for interval timing. Consistent
with recent animal studies, human participants initiated their timed
anticipatory responding earlier when expecting a larger reward in the
absence of any changes in the timing of response termination or
perceived time. This effect however was specific to two out of four
evaluated COMT and DRD2 polymorphism combinations that lead to high
prefrontal dopamine coupled with high D2 density and low prefrontal
dopamine coupled with low D2 density. Larger rewards also decreased
timing precision indices, some of which interacted with the COMT
polymorphism. Furthermore, the COMT polymorphism that leads to higher
prefrontal dopamine resulted in weaker manifestation of memory
variability (relative to threshold variability) in timed behavior. There
was no effect of DAT polymorphisms on any of the core behavioral
measures. These results suggest that the reward modulates decision
thresholds rather than clock speed, and that these effects are specific
to COMT and DRD2 epistasis effects that presumably constitute a balanced
prefrontal and striatal dopamine transmission. (C) 2012 Elsevier Ltd.
All rights reserved.

========================================================================


*Pages: 309-319 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800011
*Order Full Text [ ]

Title:
Functional anatomy of timing differs for production versus prediction of time intervals

Authors:
Coull, JT; Davranche, K; Nazarian, B; Vidal, F

Source:
*NEUROPSYCHOLOGIA*, 51 (2):309-319; SI JAN 2013

Abstract:
Timing is required both for estimating the duration of a currently
unfolding event, or predicting when a future event is likely to occur.
Yet previous studies have shown these processes to be neuroanatomically
distinct with duration estimation generally activating a distributed,
predominantly right-sided, fronto-striatal network and temporal
prediction activating left-lateralised inferior parietal cortex. So far,
these processes have been examined independently and using widely
differing paradigms. We used fMRI to identify and compare the neural
correlates of duration estimation, indexed by temporal reproduction, to
those of temporal prediction, indexed by temporal orienting, within the
same experimental paradigm. Behavioural data confirmed that accurate
representations of the cued interval were evident for both temporal
reproduction and temporal orienting tasks. Direct comparison of temporal
tasks revealed activation of a right-lateralised fronto-striatal network
when timing was measured explicitly by a temporal reproduction task but
left inferior parietal cortex, left premotor cortex and cerebellum when
timing was measured implicitly by a temporal orienting task. Therefore,
although both production and prediction of temporal intervals required
the same representation of time for their successful execution, their
distinct neural signatures likely reflect the different ways in which
this temporal representation was ultimately used: either to produce an
overt estimate of an internally generated time interval (temporal
reproduction) or to enable efficient responding by predicting the offset
of an externally specified time interval (temporal orienting). This
cortical lateralization may reflect right-hemispheric specificity for
overtly timing a currently elapsing duration and left-hemispheric
specificity for predicting future stimulus onset in order to optimize
information processing. (C) 2012 Elsevier Ltd. All rights reserved.

========================================================================


*Pages: 320-325 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800012
*Order Full Text [ ]

Title:
Dissociation of formal and temporal predictability in early auditory evoked potentials

Authors:
Schwartze, M; Farrugia, N; Kotz, SA

Source:
*NEUROPSYCHOLOGIA*, 51 (2):320-325; SI JAN 2013

Abstract:
Perceived regularity among events in the environment allows predictions
regarding the "when" and the "what" dimensions of future events. In this
context, one crucial question concerns the impact and the potentially
optimizing effect, of regular temporal structure on the processing of
"what", or formal, information. The current study addresses this issue
by investigating whether temporal and formal structure interact during
early stages of sensory processing, and by relating the respective
findings to the concept of a predictive bias in brain function. Analyses
were performed on two components of the auditory event-related-potential
of the electroencephalogram, namely the P50 and the N100. Oddball
sequences consisting of frequent standard and infrequent deviant
sinusoidal tones were presented with either regular or irregular
temporal structure in pre-attentive and attentive experimental settings
(Schwartze, Rothermich, Schmidt-Kassow, 82 Kotz, 2011). Temporal
regularity effects on pre-attentive and attentive processing of
deviance. Biological Psychology, 87, 146-151). The results confirm that
the P50 and the N100 amplitudes reliably encode formal and temporal
predictability. Similar patterns of results obtained with pre-attentive
and attentive task instructions, as well as the absence of a significant
interaction of formal and temporal structure suggest that the P50
response may be interpreted as an automatic marker of predictability,
whereas the N100 may represent a more complex marker, in which formal
and temporal structure start interacting as a function of attention. (C)
2012 Elsevier Ltd. All rights reserved.

========================================================================


*Pages: 326-339 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800013
*Order Full Text [ ]

Title:
Temporal orienting of attention is interfered by concurrent working memory updating

Authors:
Capizzi, M; Correa, A; Sanabria, D

Source:
*NEUROPSYCHOLOGIA*, 51 (2):326-339; SI JAN 2013

Abstract:
A previous dual-task study (Capizzi, Sanabria, & Correa, 2012) showed
that temporal orienting of attention was disrupted by performing a
concurrent working memory task, while sequential effects were preserved.
Here, we recorded event related potentials (ERPs) during single- and
dual-task performance to investigate how this behavioural dissociation
would be expressed in neural activity measures. The single-task
condition required participants to respond to a visual target stimulus
that could be anticipated on the basis of a highly predictive temporal
cue. The dual-task condition introduced a concurrent working memory
task, in which colour information had to be updated on every trial. The
behavioural results replicated our previous findings of impaired
temporal orienting, but preserved sequential effects, under dual-task
relative to single-task conditions. The ERPs results showed that
temporal orienting and sequential effects both modulated the cue-locked
preparatory contingent negative variation (CNV) and the target-locked N2
amplitude and P3 latency under single-task, but not under dual-task
conditions. In contrast to temporal orienting, sequential effects were
also observed at the early target-locked P1 and N1 potentials.
Crucially, only the P1 modulation survived dual-task interference. These
findings provide novel electrophysiological evidence that performance of
a concurrent working memory task may interfere in a selective way with
neural activity specifically linked to temporal orienting of attention.
(C) 2012 Elsevier Ltd. All rights reserved.

========================================================================


*Pages: 340-348 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800014
*Order Full Text [ ]

Title:
How does Parkinson's disease and aging affect temporal expectation and the implicit timing of eye movements?

Authors:
de Hemptinne, C; Ivanoiu, A; Lefevre, P; Missal, M

Source:
*NEUROPSYCHOLOGIA*, 51 (2):340-348; SI JAN 2013

Abstract:
Anticipatory eye movements are often evoked by the temporal expectation
of an upcoming event. Temporal expectation is based on implicit timing
about when a future event could occur. Implicit timing emerges from
observed temporal regularities in a changing stimulus without any
voluntary estimate of elapsed time, unlike explicit timing.
The neural bases of explicit and implicit timing are likely different.
It has been shown that the basal ganglia (BG) play a central role in
explicit timing. In order to determine the influence of BG in implicit
timing, we investigated the influence of early Parkinson's disease (PD)
and aging on the latency of anticipatory eye movements. We hypothesized
that a deficit of implicit timing should yield inadequate temporal
expectations, and consequently abnormally timed anticipatory eye
movements compared with age-matched controls. To test this hypothesis,
we used an oculomotor paradigm where anticipation of a salient target
event plays a central role. Participants pursued a visual target that
moved along a circular path at a constant velocity. After a randomly
short (1200 ms) or long (2400 ms) forward path, the target reversed
direction, returned to its starting position and stopped.
Target motion reversal caused an abrupt 'slip' of the pursued target
image on the retina and was a particularly salient event evoking
anticipatory eye movements. Anticipatory eye movements were less
frequent in PD patients. However, the timing of anticipation of target
motion reversal was statistically similar in PD patients and control
subjects. Other eye movements showed statistically significant
differences between PD and controls, but these differences could be
attributed to other factors.
We conclude that all anticipatory eye movements are not similarly
impaired in PD and that implicit timing of salient events seems largely
unaffected by this disease. The results support the hypothesis that
implicit and explicit timing are differently affected by BG dysfunction.
(C) 2012 Elsevier Ltd. All rights reserved.

========================================================================


*Pages: 349-357 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800015
*Order Full Text [ ]

Title:
Oscillatory activity during maintenance of spatial and temporal information in working memory

Authors:
Roberts, BM; Hsieh, LT; Ranganath, C

Source:
*NEUROPSYCHOLOGIA*, 51 (2):349-357; SI JAN 2013

Abstract:
Working memory (WM) processes help keep information in an active state
so it can be used to guide future behavior. Although numerous studies
have investigated brain activity associated with spatial WM in humans
and monkeys, little research has focused on the neural mechanisms of WM
for temporal order information, and how processing of temporal and
spatial information might differ. Available evidence indicates that
similar frontoparietal regions are recruited during temporal and spatial
WM, although there are data suggesting that they are distinct processes.
The mechanisms that allow for differential maintenance of these two
types of information are unclear. One possibility is that neural
oscillations may differentially contribute to temporal and spatial WM.
In the present study, we used scalp electroencephalography (EEG) to
compare patterns of oscillatory activity during maintenance of spatial
and temporal information in WM. Time-frequency analysis of EEG data
revealed enhanced left frontal theta (5-8 Hz), enhanced posterior alpha
(9-12 Hz), and enhanced left posterior beta (14-28 Hz) power during the
delay period of correct temporal order trials compared to correct
spatial trials. In contrast, gamma (30-50 Hz) power at right lateral
frontal sites was increased during the delay period of spatial WM
trials, as compared to temporal WM trials. The present results are
consistent with the idea that neural oscillatory patterns provide
distinct mechanisms for the maintenance of temporal and spatial
information in WM. Specifically, theta oscillations are most critical
for the maintenance of temporal information in WM. Possible roles of
higher frequency oscillations in temporal and spatial memory are also
discussed. Published by Elsevier Ltd.

========================================================================


*Pages: 358-371 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800016
*Order Full Text [ ]

Title:
Temporal event structure and timing in schizophrenia: Preserved binding in a longer "now"

Authors:
Martin, B; Giersch, A; Huron, C; van Wassenhove, V

Source:
*NEUROPSYCHOLOGIA*, 51 (2):358-371; SI JAN 2013

Abstract:
Patients with schizophrenia experience a loss of temporal continuity or
subjective fragmentation along the temporal dimension. Here, we develop
the hypothesis that impaired temporal awareness results from a perturbed
structuring of events in time-i.e., canonical neural dynamics. To
address this, 26 patients and their matched controls took part in two
psychophysical studies using desynchronized audiovisual speech. Two
tasks were used and compared: first, an identification task testing for
multisensory binding impairments in which participants reported what
they heard while looking at a speaker's face; in a second task, we
tested the perceived simultaneity of the same audiovisual speech
stimuli. In both tasks, we used McGurk fusion and combination that are
classic ecologically valid multisensory illusions. First, and contrary
to previous reports, our results show that patients do not significantly
differ from controls in their rate of illusory reports. Second, the
illusory reports of patients in the identification task were more
sensitive to audiovisual speech desynchronies than those of controls.
Third, and surprisingly, patients considered audiovisual speech to be
synchronized for longer delays than controls. As such, the temporal
tolerance profile observed in a temporal. judgement task was less of a
predictor for sensory binding in schizophrenia than for that obtained in
controls. We interpret our results as an impairment of temporal event
structuring in schizophrenia which does not specifically affect sensory
binding operations but rather, the explicit access to timing information
associated here with audiovisual speech processing. Our findings are
discussed in the context of curent neurophysiological frameworks for the
binding and the structuring of sensory events in time. (C) 2012 Elsevier
Ltd. All rights reserved.

========================================================================


*Pages: 372-376 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800017
*Order Full Text [ ]

Title:
Lengthened temporal integration in schizophrenia

Authors:
Parsons, BD; Gandhi, S; Aurbach, EL; Williams, N; Williams, M; Wassef,
A; Eagleman, DM

Source:
*NEUROPSYCHOLOGIA*, 51 (2):372-376; SI JAN 2013

Abstract:
Research in schizophrenia has tended to emphasize deficits in higher
cognitive abilities, such as attention, memory, and executive function.
Here we provide evidence for dysfunction at a more fundamental level of
perceptual processing, temporal integration. On a measure of flicker
fusion, patients with schizophrenia exhibited significantly lower
thresholds than age and education matched healthy controls. We reasoned
that this finding could result from a longer window of temporal
integration or could reflect diminished repetition suppression: if every
frame of the repeating stimulus were represented as novel, its perceived
duration would be accordingly longer. To tease apart these non-exclusive
hypotheses, we asked patients to report the number of stimuli perceived
on the screen at once (numerosity) as they watched rapidly flashing
stimuli that were either repeated or novel. Patients reported
significantly higher numerosity than controls in all conditions, again
indicating a longer window of temporal integration in schizophrenia.
Further, patients showed the largest difference from controls in the
repeated condition, suggesting a possible effect of weaker repetition
suppression. Finally, we establish that our findings generalize to
several different classes of stimuli (letters, pictures, faces, words,
and pseudo-words), demonstrating a non-specific effect of a lengthened
window of integration. We conclude that the visual system in
schizophrenics integrates input over longer periods of time, and that
repetition suppression may also be deficient. We suggest that these
abnormalities in the processing of temporal information may underlie
higher-level deficits in schizophrenia and account for the disturbed
sense of continuity and fragmentation of events in time reported by
patients. (C) 2012 Elsevier Ltd. All rights reserved.

========================================================================


*Pages: 377-384 (Article)
*View Full Record: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord;KeyUT=CCC:000315839800018
*Order Full Text [ ]

Title:
Time, action and psychosis: Using subjective time to investigate the effects of ketamine on sense of agency

Authors:
Moore, JW; Cambridge, VC; Morgan, H; Giorlando, F; Adapa, R; Fletcher,
PC

Source:
*NEUROPSYCHOLOGIA*, 51 (2):377-384; SI JAN 2013

Abstract:
Sense of agency refers to the experience of initiating and controlling
actions in order to influence events in the outside world. A disturbed
sense of agency is found in certain psychiatric and neurological
disorders, most notably schizophrenia. Sense of agency is associated
with a subjective compression of time: actions and their outcomes are
perceived as bound together in time. This is known as 'intentional
binding' and, in healthy adults, depends partly on advance prediction of
action outcomes. Notably, this predictive contribution is disrupted in
patients with schizophrenia. In the present study we aimed to
characterise the psychotomimetic effect of ketamine, a drug model for
psychosis, on the predictive contribution to intentional binding. It was
shown that ketamine produced a disruption that closely resembled
previous data from patients in the early, prodromal, stage of
schizophrenic illness. These results are discussed in terms of
established models of delusion formation in schizophrenia. The link
between time and agency, more generally, is also considered. (C) 2012
Elsevier Ltd. All rights reserved.