期刊
JOURNAL OF PSYCHOPHYSIOLOGY
卷 16, 期 2, 页码 97-106出版社
HOGREFE & HUBER PUBLISHERS
DOI: 10.1027//0269-8803.16.2.97
关键词
contingent negative variation; children; neuropsychology
Contingent negative variation (CNV) and evoked potentials were recorded during the continuous performance test in 20 children (aged 7 to 12) with attention deficit/hyperactivity disorder (ADHD) and in 19 age-matched healthy children. A series of letters were displayed every 2.1 s and a button had to be pressed whenever the letter O was followed by an X. Children were also given neuropsychological tests and questionnaires assessing anxiety and depression. Unlike ADHD children, healthy children showed a more pronounced CNV after the cue - the letter O - than after the distractors. At Fz, CNV negativity was significantly correlated with IQ and executive function. Control children also exhibited a higher parietal N375 post S1 - likely to be associated with letter processing - and a higher N550 amplitude at Fz then ADHD children at pose S1 and S2; both groups showed a higher N550 amplitude whenever X followed non-O or O was followed by non-X. This component appears to be involved in decision-making processes regarding the initiation or inhibition of movement. ADHD children had a faster reaction time but made more errors of omission and commission. Results suggest that ADHD children shoe deficits in both stimulus processing and response execution.
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