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Cognitive control in the intertrial interval: evidence from EEG alpha power.
Rebecca J Compton1, Daniel Arnstein, Gili Freedman
1Department of Psychology, Haverford College, Haverford, Pennsylvania 19041, USA. rcompton@haverford.edu
Psychophysiology
|September 16, 2010
Summary
Neural activity, measured by electroencephalogram (EEG) alpha power, increased after errors and conflict during the Stroop task. This suggests the brain adjusts cognitive processes in response to errors and conflict.
Area of Science:
- Cognitive Neuroscience
- Neurophysiology
Background:
- The intertrial interval is crucial for cognitive adjustments.
- Online error and conflict monitoring are key executive functions.
Purpose of the Study:
- To investigate neural activity during the intertrial interval using electroencephalogram (EEG).
- To examine EEG alpha power as an index of cerebral activity following errors and conflict in a Stroop task.
Main Methods:
- Electroencephalogram (EEG) power spectrum analysis was employed.
- Participants completed a Stroop task, and EEG data were recorded.
- EEG alpha power was quantified during the intertrial interval.
Main Results:
- Alpha power was significantly reduced after error responses compared to correct responses.
- Reduced alpha power was observed after conflict trials versus no-conflict trials.
- Hemispheric differences in alpha power suggested distinct roles in behavioral control.
Conclusions:
- Increased cerebral activity, indicated by reduced alpha power, follows errors and conflict.
- Conflict processing engages mental adjustment mechanisms.
- Hemispheric specialization contributes to behavioral regulation.