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Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/12739

Title: Dissociation in performance of children with ADHD and autism on a task of sustained attention
Author: BELLGROVE, MARK
GALLAGHER, LOUISE
GILL, MICHAEL
JOHNSON, KATHERINE ANNE
ROBERTSON, IAN
Sponsor: Science Foundation Ireland
Higher Education Authority
Health Research Board
Author's Homepage: http://people.tcd.ie/johnsoka
Keywords: Response time
fast Fourier transform
variability
arousal
response inhibition
executive function
Issue Date: 2007
Citation: Johnson, K.A., Robertson, I.H., Kelly, S.P., Silk, T.J., Daibhis A, Watchorn A, Keavey M, Gallagher, L., Barry, E., Cox, M., Fitzgerald, M., Gill, M., Bellgrove, M.A., Dissociation in performance of children with ADHD and autism on a task of sustained attention, Neuropsychologia, 45, 2007, p2234 - 2245
Series/Report no.: Neuropsychologia
45
Abstract: Attention deficit hyperactivity disorder (ADHD) and autism are two neurodevelopmental disorders associated with prominent executive dysfunction, which may be underpinned by disruption within fronto-striatal and fronto-parietal circuits. We probed executive function in these disorders using a sustained attention task with a validated brain-behaviour basis. Twenty-three children with ADHD, 21 children with high-functioning autism (HFA) and 18 control children were tested on the Sustained Attention to Response Task (SART). In a fixed sequence version of the task, children were required to withhold their response to a predictably occurring no-go target (3) in a 1-9 digit sequence; in the random version the sequence was unpredictable. The ADHD group showed clear deficits in response inhibition and sustained attention, through higher errors of commission and omission on both SART versions. The HFA group showed no sustained attention deficits, through a normal number of omission errors on both SART versions. The HFA group showed dissociation in response inhibition performance, as indexed by commission errors. On the Fixed SART, a normal number of errors was made, however when the stimuli were randomised, the HFA group made as many commission errors as the ADHD group. Greater slow-frequency variability in response time and a slowing in mean response time by the ADHD group suggested impaired arousal processes. The ADHD group showed greater fast-frequency variability in response time, indicative of impaired top-down control, relative to the HFA and control groups. These data imply involvement of fronto-parietal attentional networks and sub-cortical arousal systems in the pathology of ADHD and prefrontal cortex dysfunction in children with HFA.
Description: PUBLISHED
URI: PMID: 17433378
http://hdl.handle.net/2262/12739
Appears in Collections:Psychology (Scholarly Publications)

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