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Reaction time (RT) variability on a Stop Signal task was examined among children with attention deficit hyperactivity disorder (ADHD) symptoms and/or dyslexia in comparison to typically developing (TD) controls. Children's go-trial RTs were analyzed using a novel ex-Gaussian method. Children with ADHD symptoms had increased variability in the fast but not the slow portions of their RT distributions compared to those without ADHD symptoms. The RT distributions of children with dyslexia were similar to those of TD-controls. It is argued that variability in responding may be underpinned by impairments in response preparation or timing during Stop Signal tasks.

Original publication

DOI

10.1080/87565641.2011.650809

Type

Journal article

Journal

Dev Neuropsychol

Publication Date

2012

Volume

37

Pages

453 - 472

Keywords

Adolescent, Attention Deficit Disorder with Hyperactivity, Child, Dyslexia, Female, Humans, Inhibition (Psychology), Male, Neuropsychological Tests, Psychomotor Performance, Reaction Time