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Ali S, Karr JE, MacDonald SWS, Macoun SJ. Intraindividual Variability in Attention-Deficit/Hyperactivity Disorder: An Ex-Gaussian Approach. Child Psychiatry Hum Dev 2024:10.1007/s10578-024-01722-1. [PMID: 38886310 DOI: 10.1007/s10578-024-01722-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/25/2024] [Indexed: 06/20/2024]
Abstract
Higher intraindividual variability (IIV) of response times is consistently noted in children with attention-deficit/hyperactivity disorder (ADHD). The current study investigated whether an ex-Gaussian estimate of IIV in children ages 6-13 years-old could differentiate between children with and without ADHD. Children completed a computerized go/no-go task to estimate trial-by-trial IIV and a continuous performance test (CPT) to estimate inattention and hyperactivity/impulsivity. Parents completed questionnaires assessing inattention and hyperactive/impulsive behaviors. IIV, commission errors, and attention problems as rated by parents were significantly greater in the ADHD group. Groups did not differ on errors of omission, but IIV was predictive of omission errors and parent ratings of inattention and hyperactivity/impulsivity. IIV predicted group membership (ADHD vs Control) whereas errors of omission did not. However, IIV did not improve diagnostic accuracy when parent ratings were used, such that parent ratings were superior at determining diagnosis. Current results support the use of IIV, based on the ex-Gaussian approach, as an objective measure of attention problems over omission errors on sustained attention CPT-type tasks. Additionally, while parent ratings of attention impairment remain the best predictor of ADHD diagnostic status, IIV may be helpful in determining when further assessment is required in the absence of those ratings.
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Affiliation(s)
- Sheliza Ali
- Department of Neurology, University of Kentucky, Lexington, KY, USA.
| | - Justin E Karr
- Department of Psychology, University of Kentucky, Lexington, KY, USA
| | | | - Sarah J Macoun
- Department of Psychology, University of Victoria, Victoria, BC, USA
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2
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Eaton C, Roarty K, Doval N, Shetty S, Goodall K, Rhodes SM. The Prevalence of Attention Deficit/Hyperactivity Disorder Symptoms in Children and Adolescents With Autism Spectrum Disorder Without Intellectual Disability: A Systematic Review. J Atten Disord 2023; 27:1360-1376. [PMID: 37287320 PMCID: PMC10498659 DOI: 10.1177/10870547231177466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
OBJECTIVE ADHD commonly co-occurs with ASD without ID in young people. It has been difficult to obtain accurate prevalence estimates of ADHD in this population, as a dual-diagnosis was not permitted until DSM-V. We systematically reviewed the literature on the prevalence of ADHD symptoms in young people with ASD without ID. METHOD 9,050 articles were identified through six databases. Articles were reviewed against inclusion and exclusion criteria and 23 studies were included. RESULTS ADHD symptom prevalence varied from 2.6% to 95.5%. We discuss these findings according to the ADHD assessment measure, informant, diagnostic criteria, risk of bias rating and recruitment pool. CONCLUSION ADHD symptoms are common in young people with ASD without ID, but there is substantial variance in study reporting. Future studies should recruit participants from community sources, provide information on key sociodemographic sample characteristics and assess ADHD with standardized diagnostic criteria, using both parent/carer and teacher report.
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Affiliation(s)
- Christopher Eaton
- University of Edinburgh, UK
- Cardiff University School of Medicine, UK
| | - Kayley Roarty
- University of Edinburgh, UK
- Neurodevelopment Service for Children and Young People, Newmains Health Centre, Lanarkshire, UK
| | - Nimisha Doval
- Child and Adolescent Mental Health Services, NHS Grampian, UK
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3
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Einziger T, Devor T, Ben-Shachar MS, Arazi A, Dinstein I, Klein C, Auerbach JG, Berger A. Increased neural variability in adolescents with ADHD symptomatology: Evidence from a single-trial EEG study. Cortex 2023; 167:25-40. [PMID: 37517356 DOI: 10.1016/j.cortex.2023.06.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 05/17/2023] [Accepted: 06/09/2023] [Indexed: 08/01/2023]
Abstract
Increased intrasubject variability of reaction time (RT) refers to inconsistency in an individual's speed of responding to a task. This increased variability has been suggested as a fundamental feature of attention deficit hyperactivity disorder (ADHD), however, its neural sources are still unclear. In this study, we aimed to examine whether such inconsistency at the behavioral level would be accompanied by inconsistency at the neural level; and whether different types of neural and behavioral variability would be related to ADHD symptomatology. We recorded electroencephalogram (EEG) data from 62 adolescents, who were part of a prospective longitudinal study on the development of ADHD. We examined trial-by-trial neural variability in response to visual stimuli in two cognitive tasks. Adolescents with high ADHD symptomatology exhibited an increased neural variability before the presentation of the stimulus, but when presented with a visual stimulus, this variability decreased to a level that was similar to that exhibited by participants with low ADHD symptomatology. In contrast with our prediction, neural variability was unrelated to the magnitude of behavioral variability. Our findings suggest that adolescents with higher symptoms are characterized by increased neural variability before the stimulation, which might reflect a difficulty in alertness to the forthcoming stimulus; but this increased neural variability does not seem to account for their RT variability.
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Affiliation(s)
- Tzlil Einziger
- Ruppin Academic Center, Department of Behavioral Sciences, Emek Hefer, Israel.
| | - Tali Devor
- Department of Psychology, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Mattan S Ben-Shachar
- Department of Psychology, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Ayelet Arazi
- Department of Neurophysiology and Pathophysiology, University Medical Center Hamburg-Eppendorf, Germany
| | - Ilan Dinstein
- Department of Psychology, Ben-Gurion University of the Negev, Beer Sheva, Israel; Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva, Israel; National Autism Research Center of Israel, Beer Sheva, Israel
| | - Christoph Klein
- Department of Child and Adolescent Psychiatry, Medical Faculty, University of Freiburg, Germany; Department of Child and Adolescent Psychiatry, Medical Faculty, University of Cologne, Germany; 2(nd) Department of Psychiatry, National and Kapodistrian University of Athens, Greece
| | - Judith G Auerbach
- Department of Psychology, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Andrea Berger
- Department of Psychology, Ben-Gurion University of the Negev, Beer Sheva, Israel; Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva, Israel
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4
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Lukito S, O'Daly OG, Lythgoe DJ, Hodsoll J, Maltezos S, Pitts M, Simonoff E, Rubia K. Reduced inferior fronto-insular-thalamic activation during failed inhibition in young adults with combined ASD and ADHD compared to typically developing and pure disorder groups. Transl Psychiatry 2023; 13:133. [PMID: 37087490 PMCID: PMC10122665 DOI: 10.1038/s41398-023-02431-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 04/05/2023] [Accepted: 04/12/2023] [Indexed: 04/24/2023] Open
Abstract
Autism spectrum disorder (ASD) often co-occurs with attention-deficit/hyperactivity disorder (ADHD) and people with these conditions have frontostriatal functional atypicality during motor inhibition. We compared the neural and neurocognitive correlates of motor inhibition and performance monitoring in young adult males with "pure" and combined presentations with age-and sex-matched typically developing controls, to explore shared or disorder-specific atypicality. Males aged 20-27 years with typical development (TD; n = 22), ASD (n = 21), combined diagnoses ASD + ADHD (n = 23), and ADHD (n = 25) were compared using a modified tracking fMRI stop-signal task that measures motor inhibition and performance monitoring while controlling for selective attention. In addition, they performed a behavioural go/no-go task outside the scanner. While groups did not differ behaviourally during successful stop trials, the ASD + ADHD group relative to other groups had underactivation in typical performance monitoring regions of bilateral anterior insula/inferior frontal gyrus, right posterior thalamus, and right middle temporal gyrus/hippocampus during failed inhibition, which was associated with increased stop-signal reaction time. In the behavioural go/no-go task, both ADHD groups, with and without ASD, had significantly lower motor inhibition performance compared to TD controls. In conclusion, only young adult males with ASD + ADHD had neurofunctional atypicality in brain regions associated with performance monitoring, while inhibition difficulties on go/no-go task performance was shared with ADHD. The suggests that young people with ASD + ADHD are most severely impaired during motor inhibition tasks compared to ASD and ADHD but do not reflect a combination of the difficulties associated with the pure disorders.
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Affiliation(s)
- Steve Lukito
- Department of Child and Adolescent Psychiatry, King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK.
| | - Owen G O'Daly
- Department of Neuroimaging, King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - David J Lythgoe
- Department of Neuroimaging, King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - John Hodsoll
- Department of Biostatistics and Health Informatics, King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - Stefanos Maltezos
- The Adult Attention-Deficit/Hyperactivity Disorder (ADHD) and Autism National Service, Behavioural and Developmental Psychiatry Clinical Academic Group, South London and Maudsley Foundation NHS Trust, London, UK
| | - Mark Pitts
- The Adult Attention-Deficit/Hyperactivity Disorder (ADHD) and Autism National Service, Behavioural and Developmental Psychiatry Clinical Academic Group, South London and Maudsley Foundation NHS Trust, London, UK
| | - Emily Simonoff
- Department of Child and Adolescent Psychiatry, King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - Katya Rubia
- Department of Child and Adolescent Psychiatry, King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
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5
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Espenhahn S, Godfrey KJ, Kaur S, McMorris C, Murias K, Tommerdahl M, Bray S, Harris AD. Atypical Tactile Perception in Early Childhood Autism. J Autism Dev Disord 2022:10.1007/s10803-022-05570-7. [PMID: 35482274 DOI: 10.1007/s10803-022-05570-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/09/2022] [Indexed: 11/24/2022]
Abstract
We assessed different aspects of tactile perception in young children (3-6 years) with autism. Autistic and neurotypical children completed vibrotactile tasks assessing reaction time, amplitude discrimination (sequential and simultaneous) and temporal discrimination (temporal order judgment and duration discrimination). Autistic children had elevated and more variable reaction times, suggesting slower perceptual-motor processing speed and/or greater distractibility. Children with autism also showed higher amplitude discrimination and temporal order judgement thresholds compared to neurotypical children. Tactile perceptual metrics did not associate with social or tactile sensitivities measured by parent-reports. Altered tactile behavioral responses appear in early childhood, can be quantified but appear dissociated from sensitivity. This implies these measures are complementary, but not necessarily related, phenomena of atypical tactile perception in autism.
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Affiliation(s)
- Svenja Espenhahn
- Department of Radiology, Cumming School of Medicine, University of Calgary Alberta Children's Hospital, Office B4-512 28 Oki Drive NW, T3B 6A8, Calgary, AB, Canada.,Owerko Centre, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Kate J Godfrey
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada.,Owerko Centre, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada.,Department of Neuroscience, University of Calgary, Calgary, AB, Canada
| | - Sakshi Kaur
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada.,Owerko Centre, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Carly McMorris
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada.,Owerko Centre, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada.,Werklund School of Education, University of Calgary, Calgary, Alberta, Canada
| | - Kara Murias
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada.,Owerko Centre, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada.,Department of Pediatrics, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Mark Tommerdahl
- Department of Biomedical Engineering, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Signe Bray
- Department of Radiology, Cumming School of Medicine, University of Calgary Alberta Children's Hospital, Office B4-512 28 Oki Drive NW, T3B 6A8, Calgary, AB, Canada.,Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada.,Owerko Centre, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Ashley D Harris
- Department of Radiology, Cumming School of Medicine, University of Calgary Alberta Children's Hospital, Office B4-512 28 Oki Drive NW, T3B 6A8, Calgary, AB, Canada. .,Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada. .,Owerko Centre, University of Calgary, Calgary, AB, Canada. .,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada.
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6
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Canu D, Ioannou C, Müller K, Martin B, Fleischhaker C, Biscaldi M, Beauducel A, Smyrnis N, van Elst LT, Klein C. Visual search in neurodevelopmental disorders: evidence towards a continuum of impairment. Eur Child Adolesc Psychiatry 2022; 31:1-18. [PMID: 33751240 PMCID: PMC9343296 DOI: 10.1007/s00787-021-01756-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 03/08/2021] [Indexed: 02/07/2023]
Abstract
Disorders with neurodevelopmental aetiology such as Attention-Deficit/Hyperactivity Disorder (ADHD), Autism Spectrum Disorder (ASD) and Schizophrenia share commonalities at many levels of investigation despite phenotypic differences. Evidence of genetic overlap has led to the concept of a continuum of neurodevelopmental impairment along which these disorders can be positioned in aetiological, pathophysiological and developmental features. This concept requires their simultaneous comparison at different levels, which has not been accomplished so far. Given that cognitive impairments are core to the pathophysiology of these disorders, we provide for the first time differentiated head-to-head comparisons in a complex cognitive function, visual search, decomposing the task with eye movement-based process analyses. N = 103 late-adolescents with schizophrenia, ADHD, ASD and healthy controls took a serial visual search task, while their eye movements were recorded. Patients with schizophrenia presented the greatest level of impairment across different phases of search, followed by patients with ADHD, who shared with patients with schizophrenia elevated intra-subject variability in the pre-search stage. ASD was the least impaired group, but similar to schizophrenia in post-search processes and to schizophrenia and ADHD in pre-search processes and fixation duration while scanning the items. Importantly, the profiles of deviancy from controls were highly correlated between all three clinical groups, in line with the continuum idea. Findings suggest the existence of one common neurodevelopmental continuum of performance for the three disorders, while quantitative differences appear in the level of impairment. Given the relevance of cognitive impairments in these three disorders, we argue in favour of overlapping pathophysiological mechanisms.
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Affiliation(s)
- Daniela Canu
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
| | - Chara Ioannou
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Katarina Müller
- Psychotherapeutisches Wohnheim für junge Menschen Leppermühle, Buseck, Germany
| | - Berthold Martin
- Psychotherapeutisches Wohnheim für junge Menschen Leppermühle, Buseck, Germany
| | - Christian Fleischhaker
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Monica Biscaldi
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | | | - Nikolaos Smyrnis
- 2nd Psychiatry Department, National and Kapodistrian University of Athens, Medical School, University General Hospital "ATTIKON", Athens, Greece
| | - Ludger Tebartz van Elst
- Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Christoph Klein
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
- 2nd Psychiatry Department, National and Kapodistrian University of Athens, Medical School, University General Hospital "ATTIKON", Athens, Greece.
- Department of Child and Adolescent Psychiatry, Medical Faculty, University of Cologne, Cologne, Germany.
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7
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Chen B. A Preliminary Study of Abnormal Centrality of Cortical Regions and Subsystems in Whole Brain Functional Connectivity of Autism Spectrum Disorder Boys. Clin EEG Neurosci 2022; 53:3-11. [PMID: 34152841 DOI: 10.1177/15500594211026282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The abnormal cortices of autism spectrum disorder (ASD) brains are uncertain. However, the pathological alterations of ASD brains are distributed throughout interconnected cortical systems. Functional connections (FCs) methodology identifies cooperation and separation characteristics of information process in macroscopic cortical activity patterns under the context of network neuroscience. Embracing the graph theory concepts, this paper introduces eigenvector centrality index (EC score) ground on the FCs, and further develops a new framework for researching the dysfunctional cortex of ASD in holism significance. The important process is to uncover noticeable regions and subsystems endowed with antagonistic stance in EC-scores of 26 ASD boys and 28 matched healthy controls (HCs). For whole brain regional EC scores of ASD boys, orbitofrontal superior medial cortex, insula R, posterior cingulate gyrus L, and cerebellum 9 L are endowed with different EC scores significantly. In the brain subsystems level, EC scores of DMN, prefrontal lobe, and cerebellum are aberrant in the ASD boys. Generally, the EC scores display widespread distribution of diseased regions in ASD brains. Meanwhile, the discovered regions and subsystems, such as MPFC, AMYG, INS, prefrontal lobe, and DMN, are engaged in social processing. Meanwhile, the CBCL externalizing problem scores are associated with EC scores.
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Affiliation(s)
- Bo Chen
- 12626Hangzhou Dianzi University, Hangzhou, Zhejiang, PR China
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8
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Thomson P, Johnson KA, Malpas CB, Efron D, Sciberras E, Silk TJ. Head Motion During MRI Predicted by out-of-Scanner Sustained Attention Performance in Attention-Deficit/Hyperactivity Disorder. J Atten Disord 2021; 25:1429-1440. [PMID: 32189534 DOI: 10.1177/1087054720911988] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Objective: To characterize head movements in children with ADHD using an ex-Gaussian distribution and examine associations with out-of-scanner sustained attention. Method: Fifty-six children with ADHD and 61 controls aged 9 to 11 years completed the Sustained Attention to Response Task (SART) and resting-state functional magnetic resonance imaging (fMRI). In-scanner head motion was calculated using ex-Gaussian estimates for mu, sigma, and tau in delta variation signal and framewise displacement. Sustained attention was evaluated through omission errors and tau in response time on the SART. Results: Mediation analysis revealed that out-of-scanner attention lapses (omissions during the SART) mediated the relationship between ADHD diagnosis and in-scanner head motion (tau in delta variation signal), indirect effect: B = 1.29, 95% confidence interval (CI) = [0.07, 3.15], accounting for 29% of the association. Conclusion: Findings suggest a critical link between trait-level sustained attention and infrequent large head movements during scanning (tau in head motion) and highlight fundamental challenges in measuring the neural basis of sustained attention.
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Affiliation(s)
- Phoebe Thomson
- The University of Melbourne, Victoria, Australia.,Murdoch Children's Research Institute, Parkville, Victoria, Australia
| | | | - Charles B Malpas
- The University of Melbourne, Victoria, Australia.,Murdoch Children's Research Institute, Parkville, Victoria, Australia
| | - Daryl Efron
- The University of Melbourne, Victoria, Australia.,Murdoch Children's Research Institute, Parkville, Victoria, Australia.,The Royal Children's Hospital, Parkville, Victoria, Australia
| | - Emma Sciberras
- The University of Melbourne, Victoria, Australia.,Murdoch Children's Research Institute, Parkville, Victoria, Australia.,The Royal Children's Hospital, Parkville, Victoria, Australia.,Deakin University, Burwood, Victoria, Australia
| | - Timothy J Silk
- The University of Melbourne, Victoria, Australia.,Murdoch Children's Research Institute, Parkville, Victoria, Australia.,Deakin University, Burwood, Victoria, Australia
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9
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Salunkhe G, Weissbrodt K, Feige B, Saville CWN, Berger A, Dundon NM, Bender S, Smyrnis N, Beauducel A, Biscaldi M, Klein C. Examining the Overlap Between ADHD and Autism Spectrum Disorder (ASD) Using Candidate Endophenotypes of ADHD. J Atten Disord 2021; 25:217-232. [PMID: 29896994 DOI: 10.1177/1087054718778114] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
UNLABELLED Objective: Recent discussions of aetiological overlap between ADHD and Autism Spectrum Disorder (ASD) require comparative studying of these disorders. METHOD We examined performance of ASD patients with (ASD+) and without (ASD-) comorbid ADHD, ADHD patients, and controls for selected putative endophenotypes of ADHD: Intrasubject Variability (ISV) of reaction times, working memory (WM), inhibition, and temporal processing. RESULTS We found that patients with ADHD or ASD+, but not ASD-, had elevated ISV across the entire task battery and temporal processing deficits, and that none of the groups were impaired in WM or inhibition. High levels of ISV and generally poor performance in ASD+ patients were only partially due to additive effects of the pure disorders. CONCLUSION Overall, we conclude that, within our limited but heterogeneous task battery, ISV and temporal processing deficits are most sensitive to ADHD symptomatology and that controlling for ADHD comorbidity is mandatory when assessing ISV in autism.
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Affiliation(s)
- G Salunkhe
- Department of Child and Adolescent Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, University of Freiburg, Germany
| | - K Weissbrodt
- Department of Child and Adolescent Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, University of Freiburg, Germany
| | - B Feige
- Department of Psychiatry and Psychotherapy, Medical Faculty, University of Freiburg, Germany
| | | | - A Berger
- Department of Psychology and Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - N M Dundon
- Department of Child and Adolescent Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, University of Freiburg, Germany
| | - S Bender
- Department of Child and Adolescent Psychiatry, Medical Faculty, University of Cologne, Germany
| | - N Smyrnis
- Department of Psychiatry, National and Kapodistrian University of Athens, Eginition Hospital, Greece
| | - A Beauducel
- Department for Research Methods, Diagnostics and Evaluation, Rheinische Friedrich-Wilhelms-Universität, Bonn, Germany
| | - M Biscaldi
- Department of Child and Adolescent Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, University of Freiburg, Germany
| | - C Klein
- Department of Child and Adolescent Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, University of Freiburg, Germany.,Department of Child and Adolescent Psychiatry, Medical Faculty, University of Cologne, Germany
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10
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Look duration at the face as a developmental endophenotype: elucidating pathways to autism and ADHD. Dev Psychopathol 2020; 32:1303-1322. [DOI: 10.1017/s0954579420000930] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
AbstractIdentifying developmental endophenotypes on the pathway between genetics and behavior is critical to uncovering the mechanisms underlying neurodevelopmental conditions. In this proof-of-principle study, we explored whether early disruptions in visual attention are a unique or shared candidate endophenotype of autism spectrum disorder (ASD) and attention-deficit/hyperactivity disorder (ADHD). We calculated the duration of the longest look (i.e., peak look) to faces in an array-based eye-tracking task for 335 14-month-old infants with and without first-degree relatives with ASD and/or ADHD. We leveraged parent-report and genotype data available for a proportion of these infants to evaluate the relation of looking behavior to familial (n = 285) and genetic liability (using polygenic scores, n = 185) as well as ASD and ADHD-relevant temperament traits at 2 years of age (shyness and inhibitory control, respectively, n = 272) and ASD and ADHD clinical traits at 6 years of age (n = 94).Results showed that longer peak looks at the face were associated with elevated polygenic scores for ADHD (β = 0.078, p = .023), but not ASD (β = 0.002, p = .944), and with elevated ADHD traits in mid-childhood (F(1,88) = 6.401, p = .013, $\eta _p^2$=0.068; ASD: F (1,88) = 3.218, p = .076), but not in toddlerhood (ps > 0.2). This pattern of results did not emerge when considering mean peak look duration across face and nonface stimuli. Thus, alterations in attention to faces during spontaneous visual exploration may be more consistent with a developmental endophenotype of ADHD than ASD. Our work shows that dissecting paths to neurodevelopmental conditions requires longitudinal data incorporating polygenic contribution, early neurocognitive function, and clinical phenotypic variation.
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11
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Chen B. A preliminary study of atypical cortical change ability of dynamic whole-brain functional connectivity in autism spectrum disorder. Int J Neurosci 2020; 132:213-225. [PMID: 32762276 DOI: 10.1080/00207454.2020.1806837] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
OBJECTIVES Designing new objectively diagnostic methods of autism spectrum disorder (ASD) are burning questions. Dynamic functional connectivity (DFC) methodology based on fMRI data are an effective lever to investigate changeability evolution of signal synchronization in macroscopic neural activity patterns. METHODS Embracing the network dynamics concepts, this paper introduces changeability index (C-score)which is focused on time-varying aspects of FCs, and develops a new framework for researching the roots of ASD brains at resting states in holism significance. The important process is to uncover noticeable regions and subsystems endowed with antagonistic stance in C-scores of between atypical and typical DFCs of 30 healthy controls (HCs) and 48 ASD patients. RESULTS The abnormities of edge C-scores are found across widespread brain cortex in ASD brains. For whole brain regional C-scores of ASD patients, orbitofrontal middle cortex L, inferior triangular frontal gyrus L, middle occipital gyrus L, postcentral gyrus L, supramarginal L, supramarginal R, cerebellum 8 L, and cerebellum 10 Rare endowed with significantly different C-scores.At brain subsystems level, C-scores in left hemisphere, right hemisphere, top hemisphere, bottom hemisphere, frontal lobe, parietal lobe, occipital lobe, cerebellum sub systems are abnormal in ASD patients. CONCLUSIONS The ASD brains have whole-brain abnormity on widespread regions. Through the strict evidence-based study, it was found that the changeability index (C-score) is a meaningful biological marker to explore cortical activity in ASD.
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Affiliation(s)
- Bo Chen
- School of Science, Hangzhou Dianzi University, Hangzhou, Zhejiang, PR China
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12
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Adamo N, Hodsoll J, Asherson P, Buitelaar JK, Kuntsi J. Ex-Gaussian, Frequency and Reward Analyses Reveal Specificity of Reaction Time Fluctuations to ADHD and Not Autism Traits. JOURNAL OF ABNORMAL CHILD PSYCHOLOGY 2020; 47:557-567. [PMID: 30027330 PMCID: PMC6397137 DOI: 10.1007/s10802-018-0457-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Both attention-deficit/hyperactivity disorder (ADHD) and autism spectrum disorder (ASD) have been linked to increased reaction time variability (RTV), a marker of attentional fluctuation. Here we test whether specificity to either trait emerges when we examine (1) detailed ex-Gaussian and frequency RTV subcomponents, (2) effects while controlling for the other trait and (3) improvement in the RTV measures following rewards or a faster event rate. 1110 children aged 7-10 years from a population-based sample completed a Go/No-Go task under three conditions (slow, fast and incentives). We measured RTV with standard deviation of RT (SDRT), ex-Gaussian distribution measures (Sigma and Tau), RT fluctuations in cycles of ~14-90 s in all conditions (Slow-4 and Slow-5), and RT fluctuations in cycles of 2-14 s in the fast condition (Slow-2 and Slow-3). Parent-rated ADHD and ASD traits were obtained. All refined RTV components were linked to ADHD traits only and not to ASD traits, while Sigma did not relate to either trait. Although both ADHD and ASD social-communication traits were associated with SDRT, the association with social-communication impairments disappeared when controlling for ADHD traits. A reward-induced improvement in RTV measures, indicating malleability, emerged in relation to ADHD traits but not ASD traits. Under closer inspection, specificity emerges of high RTV to ADHD traits. For the clinician, our findings indicate that attentional fluctuation in children with high ASD traits may be due to co-occurring ADHD traits and emphasise how the effectiveness of rewards does not generalise from ADHD to ASD traits.
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Affiliation(s)
- Nicoletta Adamo
- Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, De Crespigny Park (PO80), London, SE5 8AF, UK
| | - John Hodsoll
- Department of Biostatistics & Health Informatics, Institute of Psychiatry, Psychology and Neuroscience, King's College London, De Crespigny Park (PO20), London, SE5 8AF, UK
| | - Philip Asherson
- Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, De Crespigny Park (PO80), London, SE5 8AF, UK
| | - Jan K Buitelaar
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Centre, Trigon building, Route 200, Kapittelweg 29, 6525 EN, Nijmegen, The Netherlands
| | - Jonna Kuntsi
- Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, De Crespigny Park (PO80), London, SE5 8AF, UK.
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13
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Variability of Coordination in Typically Developing Children Versus Children with Autism Spectrum Disorder with and without Rhythmic Signal. SENSORS 2020; 20:s20102769. [PMID: 32414059 PMCID: PMC7284634 DOI: 10.3390/s20102769] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/08/2020] [Accepted: 05/11/2020] [Indexed: 12/27/2022]
Abstract
Motor coordination deficit is a cardinal feature of autism spectrum disorder (ASD). The evaluation of coordination of children with ASD is either lengthy, subjective (via observational analysis), or requires cumbersome post analysis. We therefore aimed to use tri-axial accelerometers to compare inter-limb coordination measures between typically developed (TD) children and children ASD, while jumping with and without a rhythmic signal. Children aged 5–6 years were recruited to the ASD group (n = 9) and the TD group (n = 19). Four sensors were strapped to their ankles and wrist and they performed at least eight consecutive jumping jacks twice: at a self-selected rhythm and with a metronome. The primary outcome measures were the timing lag (TL), the timing difference of the maximal acceleration of the left and right limbs, and the lag variability (LV), the variation of TL across the 5 jumps. The LV of the legs of children with ASD was higher compared to the LV of the legs of TD children during self-selected rhythm jumping (p < 0.01). Additionally, the LV of the arms of children with ASD, jumping with the rhythmic signal, was higher compared to that of the TD children (p < 0.05). There were no between-group differences in the TL parameter. Our preliminary findings suggest that the simple protocol presented in this study might allow an objective and accurate quantification of the intra-subject variability of children with ASD via actigraphy.
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14
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Significance of Beta-Band Oscillations in Autism Spectrum Disorders During Motor Response Inhibition Tasks: A MEG Study. Brain Topogr 2020; 33:355-374. [PMID: 32303950 PMCID: PMC7182638 DOI: 10.1007/s10548-020-00765-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 04/01/2020] [Indexed: 12/29/2022]
Abstract
In Autism Spectrum Disorders (ASD), impaired response inhibition and lack of adaptation are hypothesized to underlie core ASD symptoms, such as social communication and repetitive, stereotyped behavior. Thus, the aim of the present study was to compare neural correlates of inhibition, post-error adaptation, and reaction time variability in ASD and neuro-typical control (NTC) participants by investigating possible differences in error-related changes of oscillatory MEG activity. Twelve male NTC (mean age 20.3 ± 3.7) and fourteen male patients with ASD (mean age 17.8 ± 2.9) were included in the analysis. Subjects with ASD showed increased error-related reaction time variability. MEG analysis revealed decreased beta power in the ASD group in comparison to the NTC group over the centro-parietal channels in both, the pre-stimulus and post-response interval. In the ASD group, mean centro-parietal beta power negatively correlated with dimensional autism symptoms. In both groups, false alarms were followed by an early increase in temporo-frontal theta to alpha power; and by a later decrease in alpha to beta power at central and posterior sensors. Single trial correlations were additionally studied in the ASD group, who showed a positive correlation of pre-stimulus beta power with post-response theta, alpha, and beta power, particularly after hit trials. On a broader scale, the results deliver important insights into top-down control deficits that may relate to core symptoms observed in ASD.
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15
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Abu-Akel A, Philip RCM, Lawrie SM, Johnstone EC, Stanfield AC. Categorical and Dimensional Approaches to Examining the Joint Effect of Autism and Schizotypal Personality Disorder on Sustained Attention. Front Psychiatry 2020; 11:798. [PMID: 32848955 PMCID: PMC7426517 DOI: 10.3389/fpsyt.2020.00798] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 07/24/2020] [Indexed: 12/15/2022] Open
Abstract
INTRODUCTION Accumulating evidence for the co-occurrence autism spectrum disorder (ASD) and schizotypal personality disorder (SPD) at both the diagnostic and symptom levels raises important questions about the nature of their association and the effect of their co-occurrence on the individual's phenotype and functional outcome. Research comparing adults with ASD and SPD, as well as the impact of their co-occurrence on outcomes is extremely limited. We investigated executive functioning in terms of response inhibition and sustained attention, candidate endophenotypes of both conditions, in adults with ASD, SPD, comorbid ASD and SPD, and neurotypical adults using both categorical and dimensional approaches. METHODS A total of 88 adults (Mean Age = 37.54; SD = 10.17): ASD (n = 26; M/F = 20/6); SPD (n = 20; M/F = 14/6); comorbid ASD and SPD (n=9; M/F=6/3) and neurotypicals (n=33; M/F=23/10) completed the Sustained Attention to Response Task (SART) in both its fixed and random forms. Positive and autistic symptom severity was assessed with the positive subscale of the Positive and Negative Syndrome Scale (PANSSpos) and the PANSS Autism Severity Score (PAUSS), respectively. RESULTS Controlling for full scale IQ, working memory and medication dosage, group analyses revealed that the comorbid group committed fewer omission errors than the ASD group on the fixed SART, and fewer omission errors than the ASD and SPD groups on the random SART. The individual difference analyses of the entire sample revealed that the PANSSpos and PAUSS interactively reduced omission errors in both the fixed and random SARTs, as well as increased d' scores, indicative of improved overall performance. We observed no significant results for commission errors or reaction time. CONCLUSIONS Concurrent elevated levels of autistic and positive psychotic symptoms seem to be associated with improved sustained attention abilities (reduced omission errors) but not inhibition (commission errors). Our findings highlight the importance of investigating the concurrent effect of ASD and SPD at both the symptom and diagnostic levels, and raise important questions for future research regarding the clinical and behavioral phenotypes of adults with dual diagnosis and, more generally, about the nature of the relationship between ASD and SPD.
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Affiliation(s)
- Ahmad Abu-Akel
- Institute of Psychology, University of Lausanne, Lausanne, Switzerland
| | - Ruth C M Philip
- Tailor Ed Foundation, Edinburgh, United Kingdom.,Division of Psychiatry, University of Edinburgh, Edinburgh, United Kingdom
| | - Stephen M Lawrie
- Division of Psychiatry, University of Edinburgh, Edinburgh, United Kingdom
| | - Eve C Johnstone
- Division of Psychiatry, University of Edinburgh, Edinburgh, United Kingdom
| | - Andrew C Stanfield
- Division of Psychiatry, University of Edinburgh, Edinburgh, United Kingdom.,Patrick Wild Centre, University of Edinburgh, Edinburgh, United Kingdom
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16
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Geramita MA, Wen JA, Rannals MD, Urban NN. Decreased amplitude and reliability of odor-evoked responses in two mouse models of autism. J Neurophysiol 2019; 123:1283-1294. [PMID: 31891524 DOI: 10.1152/jn.00277.2019] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Sensory processing deficits are increasingly recognized as core symptoms of autism spectrum disorders (ASDs). However the molecular and circuit mechanisms that lead to sensory deficits are unknown. We show that two molecularly disparate mouse models of autism display similar deficits in sensory-evoked responses in the mouse olfactory system. We find that both Cntnap2- and Shank3-deficient mice of both sexes exhibit reduced response amplitude and trial-to-trial reliability during repeated odor presentation. Mechanistically, we show that both mouse models have weaker and fewer synapses between olfactory sensory nerve (OSN) terminals and olfactory bulb tufted cells and weaker synapses between OSN terminals and inhibitory periglomerular cells. Consequently, deficits in sensory processing provide an excellent candidate phenotype for analysis in ASDs.NEW & NOTEWORTHY The genetics of autism spectrum disorder (ASD) are complex. How the many risk genes generate the similar sets of symptoms that define the disorder is unknown. In particular, little is understood about the functional consequences of these genetic alterations. Sensory processing deficits are important aspects of the ASD diagnosis and may be due to unreliable neural circuits. We show that two mouse models of autism, Cntnap2- and Shank3-deficient mice, display reduced odor-evoked response amplitudes and reliability. These data suggest that altered sensory-evoked responses may constitute a circuit phenotype in ASDs.
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Affiliation(s)
- Matthew A Geramita
- Department of Neurobiology, Center for the Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Jing A Wen
- Department of Neurobiology, Center for the Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, Pennsylvania.,Department of Biology, Carnegie Mellon University, Pittsburgh, Pennsylvania
| | - Matthew D Rannals
- Department of Neurobiology, Center for the Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Nathan N Urban
- Department of Biology, Carnegie Mellon University, Pittsburgh, Pennsylvania
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17
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Coderre EL, Chernenok M, O’Grady J, Bosley L, Gordon B, Ledoux K. Implicit Measures of Receptive Vocabulary Knowledge in Individuals With Level 3 Autism. Cogn Behav Neurol 2019; 32:95-119. [PMID: 31136313 PMCID: PMC6587232 DOI: 10.1097/wnn.0000000000000194] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 02/21/2019] [Indexed: 11/26/2022]
Abstract
Implicit measures of cognition are essential for assessing knowledge in people with Level 3 autism because such individuals are often unable to make reliable overt behavioral responses. In this study, we investigated whether three implicit measures-eye movement (EM) monitoring, pupillary dilation (PD), and event-related potentials (ERPs)-can be used to reliably estimate vocabulary knowledge in individuals with Level 3 autism. Five adults with Level 3 autism were tested in a repeated-measures design with two tasks. High-frequency 'known' words (eg, bus, airplane) and low-frequency 'unknown' words (eg, ackee, cherimoya) were presented in a visual world task (during which EM and PD data were collected) and a picture-word congruity task (during which ERP data were collected). Using a case-study approach with single-subject analyses, we found that these implicit measures have the potential to provide estimates of receptive vocabulary knowledge in individuals with Level 3 autism. Participants differed with respect to which measures were the most sensitive and which variables best predicted vocabulary knowledge. These implicit measures may be useful to assess language abilities in individuals with Level 3 autism, but their use should be tailored to each individual.
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Affiliation(s)
- Emily L. Coderre
- Department of Communication Sciences and Disorders, University of Vermont, Burlington, Vermont
- Department of Neurology, Division of Cognitive Neurology/Neuropsychology, The Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Mariya Chernenok
- Department of Neurology, Division of Cognitive Neurology/Neuropsychology, The Johns Hopkins University School of Medicine, Baltimore, Maryland
- Center for Mind and Brain, University of California at Davis, Davis, California
| | - Jessica O’Grady
- Department of Neurology, Division of Cognitive Neurology/Neuropsychology, The Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Laura Bosley
- Department of Neurology, Division of Cognitive Neurology/Neuropsychology, The Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Barry Gordon
- Department of Neurology, Division of Cognitive Neurology/Neuropsychology, The Johns Hopkins University School of Medicine, Baltimore, Maryland
- Department of Cognitive Science, The Johns Hopkins University, Baltimore, Maryland
| | - Kerry Ledoux
- Department of Neurology, Division of Cognitive Neurology/Neuropsychology, The Johns Hopkins University School of Medicine, Baltimore, Maryland
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18
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Ali S, Macoun SJ, Bedir B, MacDonald SWS. Intraindividual variability in children is related to informant ratings of attention and executive function. J Clin Exp Neuropsychol 2019; 41:740-748. [PMID: 31132921 DOI: 10.1080/13803395.2019.1617249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Objective: Attention and executive function (EF) deficits are ubiquitous in neurodevelopmental disorders including Attention Deficit/Hyperactivity Disorder (ADHD), as are high levels of intraindividual variability (IIV). Attention and EF are typically assessed using informant ratings and objective measures; however, discrepancies between different metrics often make it difficult to fully characterize a child's attention capabilities, and IIV has been proposed as a potentially useful discriminator. Our objective was to explore the relationship between IIV, using the residualized intraindividual standard deviation (rISD) method, and informant ratings of attention and EF in a mixed pediatric sample, to determine the potential utility of IIV for aiding attention diagnostics. Another commonly used, though controversial, IIV indicator, the coefficient of variation (ICV), was calculated for comparison purposes. Method: We assessed 51 children with varying degrees of attention and EF deficits. Measures included parent and teacher responses on the Comprehensive Executive Function Inventory (CEFI) and response times (RT) on a go/no-go task, which were used to estimate IIV. Results: Mean RT, rISD, and ICV were significantly related to parent and teacher ratings of attention, though ICV showed a relatively weaker association. rISD also showed associations with parent ratings of working memory and self-monitoring, as well as teacher ratings of working memory. Conclusion: The significant, and relatively stronger, relationship between rISD and parent and teacher ratings of attention supports the use of this metric, compared to mean RT and ICV. The rISD indicator of IIV thus shows potential utility as a unique and objective measure of attention in children across various neurodevelopmental disorders and, with additional research, may prove useful for diagnosis of attention problems.
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Affiliation(s)
- Sheliza Ali
- a Department of Psychology , University of Victoria , Victoria , Canada
| | - Sarah J Macoun
- a Department of Psychology , University of Victoria , Victoria , Canada
| | - Buse Bedir
- a Department of Psychology , University of Victoria , Victoria , Canada
| | - Stuart W S MacDonald
- a Department of Psychology , University of Victoria , Victoria , Canada.,b Institute on Aging and Lifelong Health , University of Victoria , Victoria , Canada
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19
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Salum GA, Sato JR, Manfro AG, Pan PM, Gadelha A, do Rosário MC, Polanczyk GV, Castellanos FX, Sonuga-Barke E, Rohde LA. Reaction time variability and attention-deficit/hyperactivity disorder: is increased reaction time variability specific to attention-deficit/hyperactivity disorder? Testing predictions from the default-mode interference hypothesis. ACTA ACUST UNITED AC 2019; 11:47-58. [PMID: 30927230 DOI: 10.1007/s12402-018-0257-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Accepted: 06/08/2018] [Indexed: 12/15/2022]
Abstract
Increased reaction time variability (RTV) is one of the most replicable behavioral correlates of attention-deficit/hyperactivity disorder (ADHD). However, this may not be specific to ADHD but a more general marker of psychopathology. Here we compare RT variability in individuals with ADHD and those with other childhood internalizing and externalizing conditions both in terms of standard (i.e., the standard deviation of reaction time) and alternative indices that capture low-frequency oscillatory patterns in RT variations over time thought to mark periodic lapses of attention in ADHD. A total of 667 participants (6-12 years old) were classified into non-overlapping diagnostic groups consisting of children with fear disorders (n = 91), distress disorders (n = 56), ADHD (n = 103), oppositional defiant or conduct disorder (ODD/CD; n = 40) and typically developing controls (TDC; n = 377). We used a simple two-choice reaction time task to measure reaction time. The strength of oscillations in RTs across the session was extracted using spectral analyses. Higher RTV was present in ADHD compared to all other disorder groups, effects that were equally strong across all frequency bands. Interestingly, we found that lower RTV to characterize ODD/CD relative to TDC, a finding that was more pronounced at lower frequencies. In general, our data support RTV as a specific marker of ADHD. RT variation across time in ADHD did not show periodicity in a specific frequency band, not supporting that ADHD RTV is the product of spontaneous periodic lapses of attention. Low-frequency oscillations may be particularly useful to differentiate ODD/CD from TDC.
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Affiliation(s)
- Giovanni A Salum
- National Institute of Developmental Psychiatry for Children and Adolescents - CNPq, São Paulo, Brazil.,ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Ramiro Barcelos, 2350, Clinical Research Center, 6th Floor, Porto Alegre, 90035-903, Brazil
| | - João R Sato
- National Institute of Developmental Psychiatry for Children and Adolescents - CNPq, São Paulo, Brazil.,Universidade Federal do ABC, São Paulo, Brazil
| | - Arthur G Manfro
- National Institute of Developmental Psychiatry for Children and Adolescents - CNPq, São Paulo, Brazil. .,ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Ramiro Barcelos, 2350, Clinical Research Center, 6th Floor, Porto Alegre, 90035-903, Brazil.
| | - Pedro M Pan
- National Institute of Developmental Psychiatry for Children and Adolescents - CNPq, São Paulo, Brazil.,Universidade Federal de São Paulo, São Paulo, Brazil
| | - Ary Gadelha
- National Institute of Developmental Psychiatry for Children and Adolescents - CNPq, São Paulo, Brazil.,Universidade Federal de São Paulo, São Paulo, Brazil
| | - Maria C do Rosário
- National Institute of Developmental Psychiatry for Children and Adolescents - CNPq, São Paulo, Brazil.,Universidade Federal de São Paulo, São Paulo, Brazil
| | - Guilherme V Polanczyk
- National Institute of Developmental Psychiatry for Children and Adolescents - CNPq, São Paulo, Brazil.,Universidade de São Paulo, São Paulo, Brazil
| | - Francisco X Castellanos
- New York University Langone Medical Center, New York, NY, USA.,Nathan Kline Institute, Orangeburg, NY, USA
| | | | - Luis A Rohde
- National Institute of Developmental Psychiatry for Children and Adolescents - CNPq, São Paulo, Brazil.,ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Ramiro Barcelos, 2350, Clinical Research Center, 6th Floor, Porto Alegre, 90035-903, Brazil.,Universidade de São Paulo, São Paulo, Brazil
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20
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Salunkhe G, Feige B, Saville CWN, Lancaster TM, Stefanou ME, Bender S, Berger A, Smyrnis N, Biscaldi M, Linden DEJ, Klein C. The impact of the COMT genotype and cognitive demands on facets of intra-subject variability. Brain Cogn 2019; 132:72-79. [PMID: 30903983 DOI: 10.1016/j.bandc.2019.03.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 03/16/2019] [Accepted: 03/16/2019] [Indexed: 12/22/2022]
Abstract
Intra-Subject Variability (ISV), a potential index of catecholaminergic regulation, is elevated in several disorders linked with altered dopamine function. ISV has typically been defined as reaction time standard deviation. However, the ex-Gaussian and spectral measures capture different aspects and may delineate different underlying sources of ISV; thus reflecting different facets of the construct. We examined the impact of factors associated with dopamine metabolism, namely, Catechol-O-Methyltransferase Val158Met (COMT) genotype and Working Memory (WM) and response-switching on ISV facets in young healthy adults. The Met allele was associated with overall increased variability. The rather exclusive sensitivity of ex-Gaussian tau to frequencies below 0.025 Hz and the quasi-periodic structure of particularly slow responses support the interpretation of tau as low frequency fluctuations of neuronal networks. Sigma, by contrast, may reflect neural noise. Regarding cognitive demands, a WM load-related increase in variability was present for all genotypes and all ISV facets. Contrastingly, ISV facets reacted differently to variations in response-switching as, across genotypes, sigma was elevated for rare target trials whereas tau was elevated for frequent standard trials, particularly for Met homozygotes. Our findings support the significant role of COMT in regulating behavioural ISV with its facetted structure and presumed underlying neural processes.
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Affiliation(s)
- G Salunkhe
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Faculty, University of Freiburg, Germany
| | - B Feige
- Department of Psychiatry and Psychotherapy, Medical Faculty, University of Freiburg, Germany
| | - C W N Saville
- School of Psychology, Bangor University, United Kingdom
| | - T M Lancaster
- Neuroscience and Mental Health Research Institute, Cardiff University, United Kingdom
| | - M E Stefanou
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Faculty, University of Freiburg, Germany
| | - S Bender
- Department of Child and Adolescent Psychiatry, Medical Faculty, University of Cologne, Germany
| | - A Berger
- Department of Psychology and Zlotowski Center of Neuroscience, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - N Smyrnis
- Department of Psychiatry, National and Kapodistrian University of Athens, Athens, Greece
| | - M Biscaldi
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Faculty, University of Freiburg, Germany
| | - D E J Linden
- School for Mental Health and Neuroscience, Maastricht University, Netherlands
| | - C Klein
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Faculty, University of Freiburg, Germany; Department of Child and Adolescent Psychiatry, Medical Faculty, University of Cologne, Germany; Department of Psychiatry, National and Kapodistrian University of Athens, Athens, Greece.
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21
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Berenguer C, Roselló B, Colomer C, Baixauli I, Miranda A. Children with autism and attention deficit hyperactivity disorder. Relationships between symptoms and executive function, theory of mind, and behavioral problems. RESEARCH IN DEVELOPMENTAL DISABILITIES 2018; 83:260-269. [PMID: 30368089 DOI: 10.1016/j.ridd.2018.10.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 08/14/2018] [Accepted: 10/06/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND The underlying mechanisms of comorbidity between autism spectrum disorder (ASD) and attention deficit hyperactivity disorder (ADHD) are still unknown. Executive function (EF) deficits and theory of mind (ToM) have been the most investigated cognitive processes. AIMS This study proposed to analyze EF, ToM and behavioral problems in children with ASD + ADHD, ADHD, ASD and typical development (TD). The relationship between ADHD and ASD symptoms with EF, ToM and behavioral problems in children with ASD + ADHD was also explored. METHODS AND PROCEDURES Participants were 124 children between 7 and 11 years old (22 ASD + ADHD, 35 ADHD, 30 ASD, and 37 TD), matched on age and IQ. Teachers evaluated EF, and parents assessed ToM skills and behavioral problems through Strengths and Difficulties Questionnaire (SDQ). OUTCOMES AND RESULTS Children with ASD + ADHD and ADHD showed impairments in EF whereas the difficulties in ToM skills of ASD + ADHD group were similar to ASD group. Inattention symptoms were significantly associated with EF metacognitive deficits and ToM difficulties in ASD + ADHD, while ASD symptoms were associated with total score in behavioral problems. CONCLUSIONS AND IMPLICATIONS These findings show the complex difficulties of children with both ASD and ADHD and support the need to take these difficulties into account when designing the treatments.
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Affiliation(s)
- Carmen Berenguer
- Department of Educational Psychology, Faculty of Psychology - University of Valencia, Avda. Blasco Ibáñez, 21, 46010, Valencia, Spain.
| | - Belén Roselló
- Department of Educational Psychology, Faculty of Psychology - University of Valencia, Avda. Blasco Ibáñez, 21, 46010, Valencia, Spain.
| | - Carla Colomer
- Department of Education, Didactics and School Organization, University Jaume I, Av. de Vicent Sos Baynat, s/n, 12071, Castellón de la Plana, Spain.
| | - Inmaculada Baixauli
- Department of Occupational Sciences, Speech Therapy, Evolutionary and Educational Psychology, Faculty of Psychology, Teaching and Education Sciences, Catholic University of Valencia "San Vicente Mártir", C/Guillem de Castro, 175, 46008, Valencia, Spain.
| | - Ana Miranda
- Department of Educational Psychology, Faculty of Psychology - University of Valencia, Avda. Blasco Ibáñez, 21, 46010, Valencia, Spain.
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22
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Galloway-Long H, Huang-Pollock C. Using inspection time and ex-Gaussian parameters of reaction time to predict executive functions in children with ADHD. INTELLIGENCE 2018; 69:186-194. [DOI: 10.1016/j.intell.2018.06.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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23
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Neuromotor and cognitive responses of adults with autism spectrum disorder compared to neurotypical adults. Exp Brain Res 2018; 236:2321-2332. [DOI: 10.1007/s00221-018-5300-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 05/24/2018] [Indexed: 10/14/2022]
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24
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Hwang-Gu SL, Lin HY, Chen YC, Tseng YH, Hsu WY, Chou MC, Chou WJ, Wu YY, Gau SSF. Symptoms of ADHD Affect Intrasubject Variability in Youths with Autism Spectrum Disorder: An Ex-Gaussian Analysis. JOURNAL OF CLINICAL CHILD AND ADOLESCENT PSYCHOLOGY 2018; 48:455-468. [PMID: 29847154 DOI: 10.1080/15374416.2018.1452151] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Increased intrasubject variability in reaction times (RT-ISV) is frequently found in individuals with autism spectrum disorder (ASD). However, how dimensional attention deficit/hyperactivity disorder (ADHD) symptoms impact RT-ISV in individuals with ASD remains elusive. We assessed 97 high-functioning youths with co-occurring ASD and ADHD (ASD+ADHD), 124 high-functioning youths with ASD only, 98 youths with ADHD only, and 249 typically developing youths, 8-18 years of age, using the Conners Continuous Performance Test (CCPT). We compared the conventional CCPT parameters (omission errors, commission errors, mean RT and RT standard error (RTSE) as well as the ex-Gaussian parameters of RT (mu, sigma, and tau) across the four groups. We also conducted regression analyses to assess the relationships between RT indices and symptoms of ADHD and ASD in the ASD group (i.e., the ASD+ADHD and ASD-only groups). The ASD+ADHD and ADHD-only groups had higher RT-ISV than the other two groups. RT-ISV, specifically RTSE and tau, was significantly associated with ADHD symptoms rather than autistic traits in the ASD group. Regression models also revealed that sex partly accounted for RT-ISV variance in the ASD group. A post hoc analysis showed girls with ASD had higher tau and RTSE values than their male counterparts. Our results suggest that RT-ISV is primarily associated with co-occurring ADHD symptoms/diagnosis in children and adolescents with ASD. These results do not support the hypothesis of response variability as a transdiagnostic phenotype for ASD and ADHD and warrant further validation at a neural level.
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Affiliation(s)
- Shoou-Lian Hwang-Gu
- a Graduate Institute of Behavioral Sciences, College of Medicine , Chang Gung University , Tao-Yuan.,b Department of Child Psychiatry , Chang Gung Memorial Hospital Linkou Branch
| | - Hsiang-Yuan Lin
- c Department of Psychiatry , National Taiwan University Hospital and College of Medicine
| | - Yu-Chi Chen
- d Graduate Institute of Behavioral Sciences, College of Medicine , Chang Gung University
| | | | - Wen-Yau Hsu
- f Department of Psychology and Research Center for Mind, Brain and Learning , National Chengchi University
| | - Miao-Chun Chou
- g Department of Child and Adolescent Psychiatry, Chang Gung Memorial Hospital, Kaohsiung Medical Center , Chang Guang University, College of Medicine
| | - Wen-Jun Chou
- g Department of Child and Adolescent Psychiatry, Chang Gung Memorial Hospital, Kaohsiung Medical Center , Chang Guang University, College of Medicine
| | - Yu-Yu Wu
- b Department of Child Psychiatry , Chang Gung Memorial Hospital Linkou Branch
| | - Susan Shur-Fen Gau
- b Department of Child Psychiatry , Chang Gung Memorial Hospital Linkou Branch.,c Department of Psychiatry , National Taiwan University Hospital and College of Medicine
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Arnett AB, Cairney BE, Wallace AS, Gerdts J, Turner TN, Eichler EE, Bernier RA. Comorbid symptoms of inattention, autism, and executive cognition in youth with putative genetic risk. J Child Psychol Psychiatry 2018; 59:268-276. [PMID: 28921525 PMCID: PMC5812799 DOI: 10.1111/jcpp.12815] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 08/03/2017] [Indexed: 11/26/2022]
Abstract
BACKGROUND Symptoms of autism spectrum disorder (ASD) and inattention (IA) are highly comorbid and associated with deficits in executive cognition. Cognitive deficits have been posited as candidate endophenotypes of psychiatric traits, but few studies have conceptualized cognitive deficits as psychiatric comorbidities. The latter model is consistent with a latent factor reflecting broader liability to neuropsychological dysfunction, and explains heterogeneity in the cognitive profile of individuals with ASD and IA. METHODS We tested competing models of covariance among symptoms of ASD, IA, and cognition in a sample of 73 youth with a known genetic mutation. RESULTS A common executive factor fit best as a cognitive comorbidity, rather than endophenotype, of the shared variance between measures of IA and ASD symptoms. Known genetic risk explained a third of the shared variance among psychiatric and cognitive measures. CONCLUSIONS Comorbid symptoms of ASD, IA, and cognitive deficits are likely influenced by common neurogenetic factors. Known genetic risk in ASD may inform future investigation of putative genetic causes of IA.
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Affiliation(s)
| | | | | | | | | | - Evan E. Eichler
- University of Washington, Department of Genome Sciences and Howard Hughes Medical Institute
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Sekera ER, Rudolph HL, Carro SD, Morales MJ, Bett GCL, Rasmusson RL, Wood TD. Depletion of Stercobilin in Fecal Matter from a Mouse Model of Autism Spectrum Disorders. Metabolomics 2017; 13:132. [PMID: 29147105 PMCID: PMC5685184 DOI: 10.1007/s11306-017-1277-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Autism spectrum disorders (ASD) are a group of neurodevelopmental disorders lacking a clinical biomarker for diagnosis. Emerging evidence shows that intestinal microflora from ASD subjects can be distinguished from controls, suggesting metabolite differences due to the action of intestinal microbes may provide a means for identifying potential biomarkers for ASD. OBJECTIVES The aim of this study was to determine if quantitative differences in levels of stercobilin and stercobilinogen, metabolites produced by biological action of intestinal microflora, exist in the fecal matter between an ASD mouse model population and controls. METHODS Pairs of fecal samples were collected from two mouse groups, an ASD model group with Timothy syndrome 2 (TS2-NEO) and a gender-matched control group. After centrifugation, supernatant was spiked with an 18O-labeled stercobilin isotopomer and subjected to solid phase extraction for processing. Extracted samples were spotted on a stainless steel plate and subjected to matrix-assisted laser desorption and ionization mass spectrometry using dihydroxybenzoic acid as the matrix (n = 5). Peak areas for bilins and 18O-stercobilin isotopomers were determined in each fecal sample. RESULTS A 40-45% depletion in stercobilin in TS2-NEO fecal samples compared with controls was observed with p < 0.05; a less dramatic depletion was observed for stercobilinogen. CONCLUSIONS The results show that stercobilin depletion in feces is observed for an ASD mouse model vs. controls. This may help to explain recent observations of a less diverse microbiome in humans with ASD and may prove helpful in developing a clinical ASD biomarker.
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Affiliation(s)
- Emily R. Sekera
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, State University of New York, Buffalo, NY
| | - Heather L. Rudolph
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, State University of New York, Buffalo, NY
| | - Stephen D. Carro
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, State University of New York, Buffalo, NY
| | - Michael J. Morales
- Department of Physiology and Biophysics, University at Buffalo, State University of New York, Buffalo, NY
| | - Glenna C. L. Bett
- Department of Physiology and Biophysics, University at Buffalo, State University of New York, Buffalo, NY
- Department of Gynecology and Obstetrics, University at Buffalo, State University of New York, Buffalo, NY
| | - Randall L. Rasmusson
- Department of Physiology and Biophysics, University at Buffalo, State University of New York, Buffalo, NY
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY
| | - Troy D. Wood
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, State University of New York, Buffalo, NY
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Liu ZZ, Qu HJ, Tian ZL, Han MJ, Fan Y, Ge LZ, Zang YF, Zhang H. Reproducibility of frequency-dependent low frequency fluctuations in reaction time over time and across tasks. PLoS One 2017; 12:e0184476. [PMID: 28910331 PMCID: PMC5598978 DOI: 10.1371/journal.pone.0184476] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Accepted: 08/21/2017] [Indexed: 11/19/2022] Open
Abstract
Objective Increased levels of reaction time variability (RTV) are characteristics of sustained attention deficits. The clinical significance of RTV has been widely recognized. However, the reliability of RTV measurements has not been widely studied. The present study aimed to assess the test-retest reliability of RTV conventional measurements, e.g., the standard deviation (SD), the coefficient of variation (CV), and a new measurement called the amplitude of low frequency fluctuation (ALFF) of RT. In addition, we aimed to assess differences and similarities of these measurements between different tasks. Method Thirty-seven healthy college students participated in 2 tasks, i.e., an Eriksen flanker task (EFT) and a simple reaction task (SRT), twice over a mean interval of 56 days. Conventional measurements of RTV including RT-SD and RT-CV were assessed first. Then the RT time series were converted into frequency domains, and RT-ALFF was further calculated for the whole frequency band (0.0023–0.167 Hz) and for a few sub-frequency bands including Slow-6 (<0.01 Hz), Slow-5 (0.01–0.027 Hz), Slow-4 (0.027–0.073 Hz), and Slow-3 (0.073–0.167 Hz). The test-retest reliability of these measurements was evaluated through intra-class correlation (ICC) tests. Differences and correlations between each EFT and SRT measurement were further examined during both visits. Results 1) The RT-ALFF of the Slow-5/4/3 and conventional measurements of RT-SD and RT-CV showed moderate to high levels of test-retest reliability. EFT RT-ALFF patterns generated slightly higher ICC values than SRT values in higher frequency bands (Slow-3), but SRT RT-ALFF values showed slightly higher ICC values than EFT values in lower frequency bands (Slow-5 and Slow-4). 2) RT-ALFF magnitudes in each sub-frequency band were greater for the SRT than those for the EFT. 3) The RT-ALFF in the Slow-4 of the EFT was found to be correlated with the RT-ALFF in the Slow-5 of the SRT for both two visits, but no consistently significant correlation was found between the same frequency bands. Conclusions These findings reveal good test-retest reliability for conventional measurements and for the RT-ALFF of RTV. The RT-ALFF presented frequency-dependent similarities across tasks. All of our results reveal the presence of different frequency structures between the two tasks, and thus the frequency-dependent characteristics of different tasks deserve more attention in future studies.
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Affiliation(s)
- Zan-Zan Liu
- Department of Psychology, Zhejiang Sci-Tech University, Hangzhou, China
| | - Hui-Jie Qu
- Department of Psychology, Zhejiang Sci-Tech University, Hangzhou, China
| | - Zhuo-Ling Tian
- Institutes of Psychological Sciences, Hangzhou Normal University, Hangzhou, China
- Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Hangzhou, China
- Center for Cognition and Brain Disorders, Hangzhou Normal University, Hangzhou, China
| | - Meng-Jian Han
- Department of Physics, Zhejiang Sci-Tech University, Hangzhou, China
| | - Yi Fan
- Institutes of Psychological Sciences, Hangzhou Normal University, Hangzhou, China
- Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Hangzhou, China
- Center for Cognition and Brain Disorders, Hangzhou Normal University, Hangzhou, China
| | - Lie-Zhong Ge
- Department of Psychology, Zhejiang Sci-Tech University, Hangzhou, China
| | - Yu-Feng Zang
- Institutes of Psychological Sciences, Hangzhou Normal University, Hangzhou, China
- Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Hangzhou, China
- Center for Cognition and Brain Disorders, Hangzhou Normal University, Hangzhou, China
- * E-mail: (YFZ); (HZ)
| | - Hang Zhang
- Paul C. Lauterbur Research Centers for Biomedical Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
- * E-mail: (YFZ); (HZ)
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Broad Cognitive Profile in Children and Adolescents with HF-ASD and in Their Siblings: Widespread Underperformance and its Clinical and Adaptive Correlates. J Autism Dev Disord 2017; 47:2153-2162. [DOI: 10.1007/s10803-017-3137-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Fasmer OB, Johansen EB. Patterns of motor activity in spontaneously hypertensive rats compared to Wistar Kyoto rats. Behav Brain Funct 2016; 12:32. [PMID: 27906019 PMCID: PMC5131462 DOI: 10.1186/s12993-016-0117-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2016] [Accepted: 11/22/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Increased motor activity is a defining characteristic of patients with ADHD, and spontaneously hypertensive rats have been suggested to be an animal model of this disorder. In the present study, we wanted to use linear and non-linear methods to explore differences in motor activity patterns in SHR/NCrl rats compared to Wistar Kyoto (WKY/NHsd) rats. METHODS A total number of 42 rats (23 SHR/NCrl and 19 WKY/NHsd, male and female) were tested. At PND 51, the animals' movements were video-recorded during an operant test procedure that lasted 90 min. Total activity level and velocity (mean and maximum), standard deviation (SD) and root mean square successive differences (RMSSD) were calculated. In addition, we used Fourier analysis, autocorrelations and two measures of complexity to characterize the time series; sample entropy and symbolic dynamics. RESULTS The SHR/NCrl rats showed increased total activity levels in addition to increased mean and maximum velocity of movements. The variability measures, SD and RMSSD, were markedly lower in the SHR/NCrl compared to the WKY/NHsd rats. At the same time, the SHR/NCrl rats displayed a higher complexity of the time series, particularly with regard to the total activity level as evidenced by analyses of sample entropy and symbolic dynamics. Autocorrelation analyses also showed differences between the two strains. In the Fourier analysis, the SHR/NCrl rats had an increased variance in the high frequency part of the spectrum, corresponding to the time period of 9-17 s. CONCLUSION The findings show that in addition to increased total activity and velocity of movement, the organization of behavior is different in SHR/NCrl relative to WKY/NHsd controls. Compared to controls, behavioral variability is reduced in SHR/NCrl at an aggregate level, and, concomitantly, more complex and unpredictable from moment-to-moment. These finding emphasize the importance of the measures and methods used when characterizing behavioral variability. If valid for ADHD, the results indicate that decreased behavioral variability can co-exist with increased behavioral complexity, thus representing a challenge to current theories of variability in ADHD.
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Affiliation(s)
- Ole Bernt Fasmer
- Department of Clinical Medicine, Section for Psychiatry, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway.,Division of Psychiatry, Haukeland University Hospital, Bergen, Norway.,K.G. Jebsen Centre for Research on Neuropsychiatric Disorders, Bergen, Norway
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Biscaldi M, Bednorz N, Weissbrodt K, Saville C, Feige B, Bender S, Klein C. Cognitive endophenotypes of attention deficit/hyperactivity disorder and intra-subject variability in patients with autism spectrum disorder. Biol Psychol 2016; 118:25-34. [DOI: 10.1016/j.biopsycho.2016.04.064] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 04/25/2016] [Accepted: 04/26/2016] [Indexed: 10/21/2022]
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Tarpey T, Petkova E, Zhu L. Stratified Psychiatry via Convexity-Based Clustering with Applications Towards Moderator Analysis. STATISTICS AND ITS INTERFACE 2016; 9:255-266. [PMID: 26998190 PMCID: PMC4794284 DOI: 10.4310/sii.2016.v9.n3.a1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Understanding heterogeneity in phenotypical characteristics, symptoms manifestations and response to treatment of subjects with psychiatric illnesses is a continuing challenge in mental health research. A long-standing goal of medical studies is to identify groups of subjects characterized with a particular trait or quality and to distinguish them from other subjects in a clinically relevant way. This paper develops and illustrates a novel approach to this problem based on a method of optimal-partitioning (clustering) of functional data. The proposed method allows for the simultaneous clustering of different populations (e.g., symptoms of drug and placebo treated patients) in order to identify prototypical outcome profiles that are distinct from one or the other treatment and outcome profiles common to the different treatments. The clustering results are used to discover potential treatment effect modifiers (i.e., moderators), in particular, moderators of specific drug effects and placebo response. A depression clinical trial is used to illustrate the method.
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Affiliation(s)
- Thaddeus Tarpey
- Department of Mathematics and Statistics, Wright State University, Dayton, Ohio 45435,
| | - Eva Petkova
- Department of Child and Adolescent Psychiatry, New York University, New York, NY 10016-6023, and Nathan S. Kline Institute for Psychiatric Research, Orangeburg, NY 10962,
| | - Liangyu Zhu
- Department of Statistics, North Carolina State University, Rayleigh, NC 27695,
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Kuiper MWM, Verhoeven EWM, Geurts HM. The role of interstimulus interval and "Stimulus-type" in prepotent response inhibition abilities in people with ASD: A quantitative and qualitative review. Autism Res 2016; 9:1124-1141. [PMID: 27091394 DOI: 10.1002/aur.1631] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Revised: 02/24/2016] [Accepted: 03/19/2016] [Indexed: 11/08/2022]
Abstract
Autism spectrum disorders (ASD) are associated with prepotent response inhibition difficulties. However, the large variation between studies suggests that understudied factors, such as interstimulus interval (ISI) and "stimulus-type" (both hypothesized proxies of stressors influencing arousal), might influence the inhibitory abilities of people with ASD. Using meta-analysis, we tested whether differences in prepotent response inhibition between people with and without ASD was influenced by ISI. There was not enough variation in "stimulus-type" between the studies to include it as a moderator. Thirty-seven studies met inclusion criteria, with a combined sample size of 950 people with ASD and 966 typically developing controls. Additionally, a qualitative review including studies comparing a neutral and an arousing condition in one experiment was performed to examine whether fast ISI or specific arousing stimuli directly influence prepotent response inhibition. The meta-analysis indicated that ISI was not a relevant moderator. The qualitative review showed that ISI and "stimulus-type" had the same effect for both groups. Although all studies regarding ISI indicated that fast ISI worsened performance, different types of stimuli had either a positive or a negative influence. This could suggest that distinctive stimuli might affect arousal differently. While we replicated the inhibition difficulties in people with ASD (g = .51), our results do not show strong ASD-specific effects of ISI or "stimulus-type" on inhibition. Nonetheless, ISI and "stimulus-type" do seem to influence performance. Future research focusing on potential underlying factors (e.g., baseline physiological arousal) is needed to examine why this is the case. Autism Res 2016, 9: 1124-1141. © 2016 International Society for Autism Research, Wiley Periodicals, Inc.
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Affiliation(s)
- Marieke W M Kuiper
- Dr. Leo Kannerhuis, Houtsniplaan 1, 6865 XZ, Doorwerth, The Netherlands.,University van Amsterdam Faculty of Social and Behavioural Sciences, Programme group Brain and Cognition, Weesperplein 4, 1018 XA, Amsterdam, The Netherlands
| | | | - Hilde M Geurts
- Dr. Leo Kannerhuis, Houtsniplaan 1, 6865 XZ, Doorwerth, The Netherlands.,University van Amsterdam Faculty of Social and Behavioural Sciences, Programme group Brain and Cognition, Weesperplein 4, 1018 XA, Amsterdam, The Netherlands
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Antshel KM, Zhang-James Y, Wagner KE, Ledesma A, Faraone SV. An update on the comorbidity of ADHD and ASD: a focus on clinical management. Expert Rev Neurother 2016; 16:279-93. [PMID: 26807870 DOI: 10.1586/14737175.2016.1146591] [Citation(s) in RCA: 108] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Attention deficit/hyperactivity disorder (ADHD) and autism spectrum disorder (ASD) commonly co-occur. With the DSM-5, clinicians are permitted to make an ASD diagnosis in the context of ADHD. In earlier versions of the DSM, this was not acceptable. Both ASD and ADHD are reported to have had substantial increases in prevalence within the past 10 years. As a function of both the increased prevalence of both disorders as well as the ability to make an ASD diagnosis in ADHD, there has been a significant amount of research focusing on the comorbidity between ADHD and ASD in the past few years. Here, we provide an update on the biological, cognitive and behavioral overlap/distinctiveness between the two neurodevelopmental disorders with a focus on data published in the last four years. Treatment strategies for the comorbid condition as well as future areas of research and clinical need are discussed.
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Affiliation(s)
- Kevin M Antshel
- a Department of Psychology , Syracuse University , Syracuse , NY , USA.,b Department of Psychiatry & Behavioral Sciences , SUNY-Upstate Medical University , Syracuse , NY , USA
| | - Yanli Zhang-James
- b Department of Psychiatry & Behavioral Sciences , SUNY-Upstate Medical University , Syracuse , NY , USA
| | - Kayla E Wagner
- a Department of Psychology , Syracuse University , Syracuse , NY , USA
| | - Ana Ledesma
- a Department of Psychology , Syracuse University , Syracuse , NY , USA
| | - Stephen V Faraone
- b Department of Psychiatry & Behavioral Sciences , SUNY-Upstate Medical University , Syracuse , NY , USA.,c K.G. Jebsen Centre for Research on Neuropsychiatric Disorders , University of Bergen , Bergen , Norway.,d Department of Neuroscience and Physiology , SUNY-Upstate Medical University , Syracuse , NY , USA
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van der Meer JMJ, Hartman CA, Thissen AJAM, Oerlemans AM, Luman M, Buitelaar JK, Rommelse NNJ. How 'core' are motor timing difficulties in ADHD? A latent class comparison of pure and comorbid ADHD classes. Eur Child Adolesc Psychiatry 2016; 25:351-60. [PMID: 26154019 PMCID: PMC4820471 DOI: 10.1007/s00787-015-0734-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Accepted: 06/14/2015] [Indexed: 12/22/2022]
Abstract
UNLABELLED Children with attention-deficit/hyperactivity disorder (ADHD) have motor timing difficulties. This study examined whether affected motor timing accuracy and variability are specific for ADHD, or that comorbidity with autism spectrum disorders (ASD) contributes to these motor timing difficulties. An 80-trial motor timing task measuring accuracy (μ), variability (σ) and infrequent long response times (τ) in estimating a 1-s interval was administered to 283 children and adolescents (8-17 years) from both a clinic and population based sample. They were divided into four latent classes based on the SCQ and CPRS-R L data. These classes were: without behavioral problems 'Normal-class' (n = 154), with only ADHD symptoms 'ADHD-class' (n = 49), and two classes with both ASD and ADHD symptoms; ADHD(+ASD)-class (n = 39) and ASD(+ADHD)-class (n = 41). The pure ADHD-class did not deviate from the Normal class on any of the motor timing measures (mean RTs 916 and 925 ms, respectively). The comorbid ADHD(+ASD) and ASD(+ADHD) classes were significantly less accurate (more time underestimations) compared to the Normal class (mean RTs 847 and 870 ms, respectively). Variability in motor timing was reduced in the younger children in the ADHD(+ASD) class, which may reflect a tendency to rush the tedious task. Only patients with more severe behavioral symptoms show motor timing deficiencies. This cannot merely be explained by high ADHD severity with ASD playing no role, as ADHD symptom severity in the pure ADHD-class and the ASD(+ADHD) class was highly similar, with the former class showing no motor timing deficits.
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Affiliation(s)
- Jolanda M. J. van der Meer
- />Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen Medical Center, Reinier Postlaan 12, 6525 GC, Nijmegen, The Netherlands , />Karakter Child and Adolescent Psychiatry University Center Nijmegen, Nijmegen, The Netherlands
| | - Catharina A. Hartman
- />Department of Psychiatry, University of Groningen Medical Centre, Groningen, The Netherlands
| | - Andrieke J. A. M. Thissen
- />Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen Medical Center, Reinier Postlaan 12, 6525 GC, Nijmegen, The Netherlands , />Karakter Child and Adolescent Psychiatry University Center Nijmegen, Nijmegen, The Netherlands
| | - Anoek M. Oerlemans
- />Karakter Child and Adolescent Psychiatry University Center Nijmegen, Nijmegen, The Netherlands , />Department of Psychiatry, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Marjolein Luman
- />Department of Psychiatry, University of Groningen Medical Centre, Groningen, The Netherlands , />Department of Clinical Neuropsychology, VU University Amsterdam, Amsterdam, The Netherlands
| | - Jan K. Buitelaar
- />Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen Medical Center, Reinier Postlaan 12, 6525 GC, Nijmegen, The Netherlands , />Karakter Child and Adolescent Psychiatry University Center Nijmegen, Nijmegen, The Netherlands
| | - Nanda N. J. Rommelse
- />Karakter Child and Adolescent Psychiatry University Center Nijmegen, Nijmegen, The Netherlands , />Department of Psychiatry, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
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Baum S, Colonius H, Thelen A, Micheli C, Wallace M. Above the Mean: Examining Variability in Behavioral and Neural Responses to Multisensory Stimuli. Multisens Res 2016. [DOI: 10.1163/22134808-00002536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Even when experimental conditions are kept constant, a robust and consistent finding in both behavioral and neural experiments designed to examine multisensory processing is striking variability. Although this variability has often been considered uninteresting noise (a term that is laden with strong connotations), emerging work suggests that differences in variability may be an important aspect in describing differences in performance between individuals and groups. In the current review, derived from a symposium at the 2015 International Multisensory Research Forum in Pisa, Italy, we focus on several aspects of variability as it relates to multisensory function. This effort seeks to expand our understanding of variability at levels of coding and analysis ranging from the single neuron through large networks and on to behavioral processes, and encompasses a number of the multimodal approaches that are used to evaluate and characterize multisensory processing including single-unit neurophysiology, electroencephalography (EEG), functional magnetic resonance imaging (fMRI), and electrocorticography (ECoG).
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Affiliation(s)
- Sarah H. Baum
- Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN, USA
| | - Hans Colonius
- Department of Cognitive Psychology, University of Oldenburg, Oldenburg, Germany
| | - Antonia Thelen
- Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN, USA
| | - Cristiano Micheli
- Department of Psychology, Carl-von-Ossietzky University, Oldenburg, Germany
| | - Mark T. Wallace
- Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN, USA
- Department of Hearing and Speech Sciences, Vanderbilt University, Nashville, TN, USA
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van Belle J, van Hulst BM, Durston S. Developmental differences in intra-individual variability in children with ADHD and ASD. J Child Psychol Psychiatry 2015; 56:1316-26. [PMID: 25871802 DOI: 10.1111/jcpp.12417] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/15/2015] [Indexed: 02/01/2023]
Abstract
BACKGROUND Intra-individual variability reflects temporal variation within an individual's performance on a cognitive task. Children with developmental disorders, such as ADHD and ASD show increased levels of intra-individual variability. In typical development, intra-individual variability decreases sharply between the ages 6 and 20. The tight link between intra-individual variability and age has led to the suggestion that it may be marker of neural development. As there is accumulating evidence that ADHD and ASD are characterised by atypical neurodevelopmental trajectories, we set out to explore developmental changes in intra-individual variability in subjects with ADHD and ASD. METHOD We used propensity score matching to match a cross-sectional sample of children with ADHD, ASD and control subjects (N = 405, aged 6-19 years old) for age, IQ and gender. We used ex-Gaussian distribution parameters to characterise intra-individual variability on fast responses (sigma) and slow responses (tau). RESULT Results showed that there was a similar decrease in mean response times with age across groups, and an interaction between age and group for measures of variability, where there was a much lower rate of change in the variability parameters (sigma and tau) for subjects with ASD compared with the other two groups. Subjects with ADHD had higher intra-individual variability, reflected by both sigma and tau, but the rate of decrease in variability with age was similar to that of the controls. CONCLUSION These results suggest that subjects with ADHD, ASD and controls differ in the rate at which intra-individual variability decreases during development, and support the idea that intra-individual variability may be a marker of neural development, mimicking the neurodevelopmental changes in these disorders.
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Affiliation(s)
- Janna van Belle
- NICHE Lab, Department of Psychiatry, Rudolf Magnus Magnus Brain Centre, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Branko M van Hulst
- NICHE Lab, Department of Psychiatry, Rudolf Magnus Magnus Brain Centre, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Sarah Durston
- NICHE Lab, Department of Psychiatry, Rudolf Magnus Magnus Brain Centre, University Medical Centre Utrecht, Utrecht, The Netherlands
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Neural variability: friend or foe? Trends Cogn Sci 2015; 19:322-8. [PMID: 25979849 DOI: 10.1016/j.tics.2015.04.005] [Citation(s) in RCA: 132] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Revised: 03/31/2015] [Accepted: 04/09/2015] [Indexed: 12/17/2022]
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van Belle J, van Raalten T, Bos DJ, Zandbelt BB, Oranje B, Durston S. Capturing the dynamics of response variability in the brain in ADHD. Neuroimage Clin 2014; 7:132-41. [PMID: 25610775 PMCID: PMC4299975 DOI: 10.1016/j.nicl.2014.11.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Revised: 11/12/2014] [Accepted: 11/23/2014] [Indexed: 01/21/2023]
Abstract
ADHD is characterized by increased intra-individual variability in response times during the performance of cognitive tasks. However, little is known about developmental changes in intra-individual variability, and how these changes relate to cognitive performance. Twenty subjects with ADHD aged 7-24 years and 20 age-matched, typically developing controls participated in an fMRI-scan while they performed a go-no-go task. We fit an ex-Gaussian distribution on the response distribution to objectively separate extremely slow responses, related to lapses of attention, from variability on fast responses. We assessed developmental changes in these intra-individual variability measures, and investigated their relation to no-go performance. Results show that the ex-Gaussian measures were better predictors of no-go performance than traditional measures of reaction time. Furthermore, we found between-group differences in the change in ex-Gaussian parameters with age, and their relation to task performance: subjects with ADHD showed age-related decreases in their variability on fast responses (sigma), but not in lapses of attention (tau), whereas control subjects showed a decrease in both measures of variability. For control subjects, but not subjects with ADHD, this age-related reduction in variability was predictive of task performance. This group difference was reflected in neural activation: for typically developing subjects, the age-related decrease in intra-individual variability on fast responses (sigma) predicted activity in the dorsal anterior cingulate gyrus (dACG), whereas for subjects with ADHD, activity in this region was related to improved no-go performance with age, but not to intra-individual variability. These data show that using more sophisticated measures of intra-individual variability allows the capturing of the dynamics of task performance and associated neural changes not permitted by more traditional measures.
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Affiliation(s)
- Janna van Belle
- NICHE Lab, Department of Psychiatry, Rudolf Magnus Brain Center, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Tamar van Raalten
- NICHE Lab, Department of Psychiatry, Rudolf Magnus Brain Center, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Dienke J. Bos
- NICHE Lab, Department of Psychiatry, Rudolf Magnus Brain Center, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Bram B. Zandbelt
- Department of Psychological Sciences, Vanderbilt University, Nashville, USA
| | - Bob Oranje
- NICHE Lab, Department of Psychiatry, Rudolf Magnus Brain Center, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Sarah Durston
- NICHE Lab, Department of Psychiatry, Rudolf Magnus Brain Center, University Medical Center Utrecht, Utrecht, The Netherlands
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Karalunas SL, Geurts HM, Konrad K, Bender S, Nigg JT. Annual research review: Reaction time variability in ADHD and autism spectrum disorders: measurement and mechanisms of a proposed trans-diagnostic phenotype. J Child Psychol Psychiatry 2014; 55:685-710. [PMID: 24628425 PMCID: PMC4267725 DOI: 10.1111/jcpp.12217] [Citation(s) in RCA: 182] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/24/2014] [Indexed: 12/11/2022]
Abstract
BACKGROUND Intraindividual variability in reaction time (RT) has received extensive discussion as an indicator of cognitive performance, a putative intermediate phenotype of many clinical disorders, and a possible trans-diagnostic phenotype that may elucidate shared risk factors for mechanisms of psychiatric illnesses. SCOPE AND METHODOLOGY Using the examples of attention deficit hyperactivity disorder (ADHD) and autism spectrum disorders (ASD), we discuss RT variability. We first present a new meta-analysis of RT variability in ASD with and without comorbid ADHD. We then discuss potential mechanisms that may account for RT variability and statistical models that disentangle the cognitive processes affecting RTs. We then report a second meta-analysis comparing ADHD and non-ADHD children on diffusion model parameters. We consider how findings inform the search for neural correlates of RT variability. FINDINGS Results suggest that RT variability is increased in ASD only when children with comorbid ADHD are included in the sample. Furthermore, RT variability in ADHD is explained by moderate to large increases (d = 0.63-0.99) in the ex-Gaussian parameter τ and the diffusion parameter drift rate, as well as by smaller differences (d = 0.32) in the diffusion parameter of nondecision time. The former may suggest problems in state regulation or arousal and difficulty detecting signal from noise, whereas the latter may reflect contributions from deficits in motor organization or output. The neuroimaging literature converges with this multicomponent interpretation and also highlights the role of top-down control circuits. CONCLUSION We underscore the importance of considering the interactions between top-down control, state regulation (e.g., arousal), and motor preparation when interpreting RT variability and conclude that decomposition of the RT signal provides superior interpretive power and suggests mechanisms convergent with those implicated using other cognitive paradigms. We conclude with specific recommendations for the field for next steps in the study of RT variability in neurodevelopmental disorders.
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Affiliation(s)
- Sarah L Karalunas
- Department of Psychiatry, Oregon Health and Science University, Portland, OR, USA
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Geurts HM, van den Bergh SFWM, Ruzzano L. Prepotent response inhibition and interference control in autism spectrum disorders: two meta-analyses. Autism Res 2014; 7:407-20. [PMID: 24596300 DOI: 10.1002/aur.1369] [Citation(s) in RCA: 140] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 02/02/2014] [Indexed: 11/11/2022]
Abstract
There is a substantial amount of data providing evidence for, but also against the hypothesis that individuals with autism spectrum disorders (ASD) encounter inhibitory control deficits. ASD is often associated with interference control deficits rather than prepotent response inhibition. Moreover, the developmental trajectory for these inhibitory control processes is hypothesized to differ in ASD as compared to typical development. In efforts to gain a more comprehensive perspective of inhibition in ASD, separate quantitative analysis for prepotent response inhibition studies and interference control studies were conducted. Together, these two meta-analyses included 41 studies with a combined sample size of 1,091 people with ASD (M age 14.8 years), and 1,306 typically developing (TD) controls (M age 13.8 years).The meta-analyses indicated that individuals with ASD show increased difficulties in prepotent response inhibition (effect size 0.55) and in interference control (effect size 0.31). In addition, age was a relevant moderator for prepotent response inhibition but not for interference control. Exploratory analyses revealed that when IQ was taken into account, heterogeneity considerably decreased among interference control studies but not among prepotent response inhibition. In contrast to the general belief, both prepotent response inhibition and interference control problems were observed in individuals with ASD. However, a large variation between studies was also found. Therefore, there remain factors beyond inhibition type, age, or IQ that significantly influence inhibitory control performance among individuals with ASD.
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Affiliation(s)
- Hilde M Geurts
- Department of Psychology, Brain & Cognition, University of Amsterdam, Amsterdam, The Netherlands; Research & Development, Dr Leo Kannerhuis, Center for Autism, Amsterdam, The Netherlands; Dutch Autism and ADHD Research Center (d'Arc), Amsterdam, The Netherlands; Cognitive Science Center Amsterdam, University of Amsterdam, Amsterdam, The Netherlands
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Understanding the neuro-developmental pathogenesis of social disability: towards a cross-disorder approach. Eur Child Adolesc Psychiatry 2014; 23:59-60. [PMID: 24446027 DOI: 10.1007/s00787-013-0516-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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