Response variability in Attention Deficit Hyperactivity Disorder: Evidence for neuropsychological heterogeneity
Data(s) |
2007
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Resumo |
Response time (RT) variability is a common finding in ADHD research. RT variability may reflect frontal cortex function and may be related to deficits in sustained attention. The existence of a sustained attention deficit in ADHD has been debated, largely because of inconsistent evidence of time-on-task effects. A fixed-sequence Sustained Attention to Response Task (SART) was given to 29 control, 39 unimpaired and 24 impaired-ADHD children (impairment defined by the number of commission errors). The response time data were analysed using the Fast Fourier Transform, to define the fast-frequency and slow-frequency contributions to overall response variability. The impaired-ADHD group progressively slowed in RT over the course of the 5.5 min task, as reflected in this group's greater slow-frequency variability. The fast-frequency trial-to-trial variability was also significantly greater, but did not differentially worsen over the course of the task. The higher error rates of the impaired-ADHD group did not become differentially greater over the length of the task. The progressive slowing in mean RT over the course of the task may relate to a deficit in arousal in the impaired-ADHD group. The consistently poor performance in fast-frequency variability and error rates may be due to difficulties in sustained attention that fluctuate on a trial-to-trial basis. (c) 2006 Elsevier Ltd. All rights reserved. |
Identificador |
http://dx.doi.org/10.1016/j.neuropsychologia.2006.03.034 http://www.scopus.com/inward/record.url?scp=33845658291&partnerID=8YFLogxK |
Idioma(s) |
eng |
Direitos |
info:eu-repo/semantics/restrictedAccess |
Fonte |
Johnson , K , Kelly , S P , Bellgrove , M A , Barry , E , Cox , M , Gill , M & Robertson , I H 2007 , ' Response variability in Attention Deficit Hyperactivity Disorder: Evidence for neuropsychological heterogeneity ' Neuropsychologia , vol 45 , no. 4 , pp. 630-638 . DOI: 10.1016/j.neuropsychologia.2006.03.034 |
Palavras-Chave | #/dk/atira/pure/subjectarea/asjc/2800/2802 #Behavioral Neuroscience #/dk/atira/pure/subjectarea/asjc/3200/3206 #Neuropsychology and Physiological Psychology |
Tipo |
article |