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Gepubliceerd in: Journal of Abnormal Child Psychology 1/2017

31-03-2016

Using the Diffusion Model to Explain Cognitive Deficits in Attention Deficit Hyperactivity Disorder

Auteurs: Cynthia Huang-Pollock, Roger Ratcliff, Gail McKoon, Zvi Shapiro, Alex Weigard, Hilary Galloway-Long

Gepubliceerd in: Research on Child and Adolescent Psychopathology | Uitgave 1/2017

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Abstract

Slow, variable, and error-prone performance on speeded reaction time (RT) tasks has been well documented in childhood ADHD, but equally well documented is the context-dependent nature of those deficits, particularly with respect to event rate. As event rates increase (or, as the interstimulus intervals become shorter), RTs decrease, a pattern of performance that has long been interpreted as evidence that cognitive deficits in ADHD are a downstream consequence of a fundamental difficulty in the regulation of arousal to meet task demands. We test the extent to which this is a misinterpretation of the data that occurs when RT and accuracy are considered separately, as is common in neurocognitive research. In two samples of children aged 8–10 with (N = 97; 33 girls) and without (N = 39; 26 girls) ADHD, we used the diffusion model, an influential computational model of RT, to examine the effect of event rate on inhibitory control in a go-no-go task. Contrary to longstanding belief, we found that fast event rates slowed the rate at which children with ADHD accumulated evidence to make a decision to “no-go”, as indexed by drift rate. This in turn resulted in a higher proportion of failed inhibits, and occurred despite increased task engagement, as reflected by changes in the starting point of the decision process. Thus, although faster event rates increased task engagement among children with ADHD, the increased engagement was unable to counteract the concurrent slowing of processing speed to “no-go” decisions. Implications for theoretical models of ADHD and treatments are discussed.

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Metagegevens
Titel
Using the Diffusion Model to Explain Cognitive Deficits in Attention Deficit Hyperactivity Disorder
Auteurs
Cynthia Huang-Pollock
Roger Ratcliff
Gail McKoon
Zvi Shapiro
Alex Weigard
Hilary Galloway-Long
Publicatiedatum
31-03-2016
Uitgeverij
Springer US
Gepubliceerd in
Research on Child and Adolescent Psychopathology / Uitgave 1/2017
Print ISSN: 2730-7166
Elektronisch ISSN: 2730-7174
DOI
https://doi.org/10.1007/s10802-016-0151-y