Response inhibition in adults with autism spectrum disorder compared to attention deficit/hyperactivity disorder.
Autism spectrum disorder (ASD) and attention deficit/hyperactivity disorder (ADHD) are hypothesised to involve core deficits in executive function. Previous studies have found evidence of a double dissociation between the disorders on specific executive functions (planning and response inhibition). To date most research has been conducted with children. No studies have directly compared the stable cognitive profile of adults. It was hypothesised that adults with ASD would show generally intact response inhibition whereas those with ADHD would show more global impairment. Participants were 24 adults aged 18-55 with high functioning ASD, 24 with ADHD, and 14 age and IQ matched controls. Participants completed three standardised measures of response inhibition. Participants with ASD had generally intact response inhibition but slow response latencies, possibly due to deficits in response initiation. Adults with ADHD did not show the more global impairments hypothesised. There were some significant differences between the clinical groups across measures of inhibition. In terms of performance style, adults with ASD were slow and accurate whilst those with ADHD showed an impulsive style.
Kings College London, Institute of Psychiatry/South London & Maudsley NHS Foundation Trust, London, UK. kate.johnston@slam.nhs.uk
Kate
K
Johnston
Anya K
AK
Madden
Jessica
J
Bramham
Ailsa J
AJ
Russell
D000293:Adolescent; D000328:Adult; D001288:Attention; D001289:Attention Deficit Disorder with Hyperactivity / Q000503:physiopathology* / Q000523:psychology; D002648:Child; D002659:Child Development Disorders, Pervasive / Q000503:physiopathology* / Q000523:psychology; D056344:Executive Function; D006801:Humans; D007266:Inhibition, Psychological; D008875:Middle Aged; D009483:Neuropsychological Tests; D011930:Reaction Time; D011795:Surveys and Questionnaires