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Event rate and event-related potentials in ADHD.
Roeljan Wiersema1, Jaap van der Meere, Herbert Roeyers
1Department of Experimental-Clinical and Health Psychology, Ghent University, Belgium. Roeljan.Wiersema@UGent.be
Summary
Children with attention deficit hyperactivity disorder (ADHD) show impaired performance with longer intervals, potentially due to insufficient effort. Their reaction times increase more with slower tasks, linked to reduced brain responses.
Area of Science:
- Neuroscience
- Developmental Psychology
- Child Psychiatry
Background:
- Children with ADHD exhibit performance deficits, particularly with longer inter-stimulus intervals (ISIs).
- The cognitive-energetic model suggests this may stem from difficulties maintaining optimal motor activation due to insufficient effort allocation.
Purpose of the Study:
- To investigate the impact of varying presentation rates on cognitive-energetic processes in children with ADHD.
- To explore the relationship between event-related potentials (ERPs) and performance in a Go/No-Go task.
Main Methods:
- Event-related potentials (ERPs) were recorded during a Go/No-Go task with fast and slow presentation rates.
- Reaction times (RT) and error rates were analyzed in relation to presentation speed and ADHD status.
Main Results:
- Children with ADHD showed a steeper increase in RT from fast to slow conditions, with a diminished P3 amplitude response.
- Response speed correlated with P3 amplitude; errors of commission in the fast condition were linked to a smaller N2, but this was moderated by comorbid ODD/CD.
- Larger P2 amplitudes suggested disturbances in early automatic information processing stages in ADHD.
Conclusions:
- The findings suggest children with ADHD may not allocate sufficient effort to adjust to changing task demands, as indicated by RT and P3 responses.
- Event rate effects partially explain performance differences, but early processing deficits also contribute to ADHD.
- Further research is needed to fully understand the neurocognitive mechanisms underlying ADHD, considering both effort allocation and automatic processing.