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Stimulus-response incompatibility effects on event-related potentials in children with attention-deficit
G Yong-Liang1, P Robaey, F Karayanidis
1Laboratoire de Psychophysiologie Cognitive et de Neuropsychiatrie, Hôpital Sainte-Justine, Université de Montréal, Canada.
Insights
Attention-deficit hyperactivity disorder (ADHD) children showed fewer correct responses but not a larger incompatibility effect. Their event-related potentials (ERPs) suggest strategic differences in information processing, not a specific deficit.
Area of Science:
- Neuroscience
- Developmental Psychology
- Cognitive Science
Background:
- Attention-deficit hyperactivity disorder (ADHD) is often associated with deficits in executive functions and response control.
- Previous research suggests potential response choice deficits in children with ADHD.
Purpose of the Study:
- To investigate the hypothesis of a response choice deficit in children with ADHD using a spatial stimulus-response compatibility (SRC) task.
- To analyze event-related potentials (ERPs) to understand the neural underpinnings of performance differences.
Main Methods:
- Recorded ERPs from 30 scalp electrodes in 21 ADHD and 21 typically developing boys during an SRC task.
- Compared behavioral performance (accuracy, response speed) and ERP components (N1, N2, P3, P650, NSW) between groups.
Main Results:
- ADHD children made fewer correct responses but did not exhibit a larger incompatibility effect on speed or accuracy.
- ADHD children displayed longer N1 latency and a larger frontal N2 condition effect, indicating increased frontal involvement.
- Task order influenced ERPs in ADHD children, with distinct effects on occipital P3, central P650, and parietal NSW compared to controls.
Conclusions:
- The findings suggest that children with ADHD exhibit strategic differences in information processing during the SRC task.
- The results do not support a specific response choice deficit but rather point to broader attentional and cognitive control variations.
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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