Stimulus-response incompatibility effects on event-related potentials in children with attention-deficit hyperactivity disorder |
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Authors: | Yong-Liang G Robaey P Karayanidis F Bourassa M Pelletier G Geoffroy G |
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Institution: | Laboratoire de Psychophysiologie Cognitive et de Neuropsychiatrie, H?pital Sainte-Justine, Université de Montréal, Canada. |
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Abstract: | In order to test the hypothesis of a response choice deficit in attention-deficit hyperactivity disorder (ADHD) children, event-related potentials (ERPs) were recorded from 30 scalp electrodes in 21 ADHD and 21 normal boys during a spatial stimulus-response compatibility (SRC) task. ADHD children made fewer correct responses than control children, but did not show a larger incompatibility effect on response speed and accuracy. In ERPs, ADHD children had longer N1 latency and larger condition effect on the frontal N2, which would reflect a greater frontal involvement for the correct responses. The ADHD group who performed the SRC task first showed a larger condition effect on an early occipital P3 only, while the ADHD group who performed the SRC task second showed a larger condition effect on a later central P650 component and on a late parietal NSW, as compared with normal controls. These results suggest strategic differences in information processing in ADHD children, rather than a specific deficit. |
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