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Bella-Fernández M, Martin-Moratinos M, Li C, Wang P, Blasco-Fontecilla H. Differences in Ex-Gaussian Parameters from Response Time Distributions Between Individuals with and Without Attention Deficit/Hyperactivity Disorder: A Meta-analysis. Neuropsychol Rev 2024; 34:320-337. [PMID: 36877328 PMCID: PMC10920450 DOI: 10.1007/s11065-023-09587-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 02/07/2023] [Indexed: 03/07/2023]
Abstract
Attention Deficit Hyperactivity Disorder (ADHD) is one of the most prevalent neurodevelopmental disorders in childhood and adolescence. Differences in reaction times (RT) in cognitive tasks have been consistently observed between ADHD and typical participants. Instead of estimating means and standard deviations, fitting non-symmetrical distributions like the ex-Gaussian, characterized by three parameters (µ, σ, and τ), account for the whole RT distributions. A meta-analysis is performed with all the available literature using ex-Gaussian distributions for comparisons between individuals with ADHD and controls. Results show that τ and σ are generally greater for ADHD samples, while µ tends to be larger for typical groups but only for younger ages. Differences in τ are also moderated by ADHD subtypes. τ and σ show, respectively, quadratic and linear relationships with inter-stimulus intervals from Continuous Performance Test and Go/No Go tasks. Furthermore, tasks and cognitive domains influence the three parameters. Interpretations of ex-Gaussian parameters and clinical implications of these findings are also discussed. Fitting ex-Gaussian distributions to RT data is a useful way to explore differences between individuals with ADHD and healthy controls.
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Affiliation(s)
- Marcos Bella-Fernández
- Hospital Universitario Puerta de Hierro Majadahonda, Madrid, Spain
- Universidad Autónoma de Madrid, Madrid, Spain
- Universidad Pontificia de Comillas, Madrid, Spain
| | - Marina Martin-Moratinos
- Hospital Universitario Puerta de Hierro Majadahonda, Madrid, Spain
- Universidad Autónoma de Madrid, Madrid, Spain
| | - Chao Li
- Universidad Autónoma de Madrid, Madrid, Spain
| | - Ping Wang
- Universidad Autónoma de Madrid, Madrid, Spain
| | - Hilario Blasco-Fontecilla
- Hospital Universitario Puerta de Hierro Majadahonda, Madrid, Spain.
- Universidad Autónoma de Madrid, Madrid, Spain.
- CIBERSAM Madrid, Madrid, Spain.
- ITA Mental Health, Madrid, Spain.
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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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Wootton O, Dalvie S, Susser E, Gur RC, Stein DJ. Within-individual variability in cognitive performance in schizophrenia: A narrative review of the key literature and proposed research agenda. Schizophr Res 2023; 252:329-334. [PMID: 36708623 PMCID: PMC9974859 DOI: 10.1016/j.schres.2023.01.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 01/18/2023] [Accepted: 01/18/2023] [Indexed: 01/27/2023]
Abstract
Schizophrenia is a neurodevelopmental disorder and a leading cause of disability worldwide. Deficits in cognitive function are characteristic of schizophrenia and are predictors of functional outcomes in the disorder. Within-individual variability (WIV) in cognitive performance is elevated in schizophrenia and has been suggested to provide additional insight into cognitive function over and above mean performance measures. Despite growing interest in WIV in schizophrenia, research on the clinical significance and neural correlates of WIV in the disorder remains sparse. The present narrative review summarizes the key literature linking WIV in schizophrenia to clinical, neural, and genetic correlates. Here, we aim to highlight key knowledge gaps and provide directions for future research into WIV in schizophrenia.
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Affiliation(s)
- Olivia Wootton
- Department of Psychiatry and Mental Health, University of Cape Town, South Africa.
| | - Shareefa Dalvie
- Department of Psychiatry and Mental Health, University of Cape Town, South Africa; Biomedical Research and Innovation Platform, South African Medical Research Council, South Africa
| | - Ezra Susser
- Department of Epidemiology, Mailman School of Public Health, Columbia University, USA; New York State Psychiatric Institute, New York, NY, USA
| | - Ruben C Gur
- Brain Behavior Laboratories, Department of Psychiatry, University of Pennsylvania Perelman School of Medicine, USA
| | - Dan J Stein
- Department of Psychiatry and Mental Health, University of Cape Town, South Africa; SAMRC Unit on Risk & Resilience in Mental Disorders, South Africa
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Schulz-Zhecheva Y, Voelkle MC, Beauducel A, Biscaldi M, Klein C. Intra-Subject Variability, Intelligence, and ADHD Traits in a Community-Based Sample. J Atten Disord 2023; 27:67-79. [PMID: 36082454 DOI: 10.1177/10870547221118523] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE The present study investigates the predictive validity of intra-subject variability (ISV) for ADHD traits in a community-based sample and the stability of the relationship between ISV and fluid intelligence (gf) across the continuum of ADHD traits. METHOD Age-residualized data from 426 participants (8-18 years, 6% ADHD) was used to investigate whether ex-Gaussian and DDM parameters derived from simple choice-reaction-time tasks can predict continuously assessed ADHD traits. Multiple-Group-Analyses and Latent-Moderated-Structural-Equations were used to test whether ADHD traits moderate the relationship between ISV and gf. RESULTS σ and μ of the ex-Gaussian model as well as DDM parameters drift rate (v) and boundary separation (a) significantly predicted general ADHD traits, while τ predicted attention difficulties specifically. Across the ADHD continuum, σ and v were significant predictors of gf. CONCLUSION The results confirm the link between ISV and ADHD. The relationship between ISV and gf appears stable across the ADHD continuum.
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Affiliation(s)
| | | | | | | | - Christoph Klein
- University of Freiburg, Germany.,University of Cologne, Germany.,National and Kapodistrian University of Athens, Germany
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Salunkhe G, Feige B, Saville CWN, Stefanou ME, Linden D, Bender S, Berger A, Smyrnis N, Biscaldi M, Klein C. Dissociating Slow Responses From Slow Responding. Front Psychiatry 2020; 11:505800. [PMID: 33132925 PMCID: PMC7562713 DOI: 10.3389/fpsyt.2020.505800] [Citation(s) in RCA: 1] [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: 10/18/2019] [Accepted: 08/21/2020] [Indexed: 11/15/2022] Open
Abstract
Increased Intra-Subject Variability (ISV) is a candidate endophenotype of ADHD. ISV's relationship with response speed is highly relevant for ADHD as patients are highly variable but typically no slower than controls. This brief report addresses the relationship between variability and speed by employing dimensional analyses for differentiated performance measures, with a particular focus on the ex-Gaussian measures, across relevant ADHD studies and in young healthy adults (N = 70). For both patients with ADHD and healthy adults, we found that reaction time standard deviation and mean reaction time were strongly correlated, thus failing to dissociate, but ex-Gaussian tau (τ) shared only little variance with Gaussian mu (μ), thus dissociating slow responses (τ) from response speed or-if given-slow responding (μ). Our results highlight the utility of employing the ex-Gaussian measures to disentangle ISV and speed, particularly for ADHD data as patients make more slow responses but are not overall slower than typical controls.
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Affiliation(s)
- Gayatri Salunkhe
- Department of Child and Adolescent Psychiatry, Psychotherapy and Psychosomatics, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Bernd Feige
- Department of Psychiatry and Psychotherapy, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | | | - Maria Elena Stefanou
- Department of Child and Adolescent Psychiatry, Psychotherapy and Psychosomatics, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,School of Psychology and Clinical Language Sciences, University of Reading, Reading, United Kingdom
| | - David Linden
- School for Mental Health and Neuroscience, Maastricht University, Maastricht, Netherlands
| | - Stephan Bender
- Department of Child and Adolescent Psychiatry, Medical Faculty, University of Cologne, Cologne, Germany
| | - Andrea Berger
- Department of Psychology, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Nikolaos Smyrnis
- Department of Psychiatry, National and Kapodistrian University of Athens, Medical School, Eginition Hospital, Athens, Greece
| | - Monica Biscaldi
- Department of Child and Adolescent Psychiatry, Psychotherapy and Psychosomatics, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Christoph Klein
- Department of Child and Adolescent Psychiatry, Psychotherapy and Psychosomatics, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Department of Child and Adolescent Psychiatry, Medical Faculty, University of Cologne, Cologne, Germany.,Department of Psychiatry, National and Kapodistrian University of Athens, Medical School, Eginition Hospital, Athens, Greece
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Abstract
The first twin study in Serbia began in 2011 as a part of the research project, 'Psychological Foundations of Mental Health: Hereditary and Environmental Factors'. At the same time, the research team from the Faculty of Philosophy and Faculty of Medicine in Novi Sad established the first Serbian twin registry. The registry is intended primarily for the purpose of the research in behavioral genetics, as well as potential future studies in human genetics. It includes information on 1658 volunteers, including twin-pairs, their parent and siblings. The behavioral genetic study of adult twins has been focused on the hereditary and environmental sources of variance of different psychological characteristics, such as personality traits, cognitive abilities, executive functions and aggression, as well as some anthropometric measures and aspects of mental and physical health. Certain molecular genetic analyses have also been performed. The research team is currently starting the longitudinal twin study of children, which will be focused on different indicators of emotional, cognitive and physical development.
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