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Cortical potentials related to the nogo decision
S R Filipović1, M Jahanshahi, J C Rothwell
1Medical Research Council Human Movement and Balance Unit, National Hospital for Neurology and Neurosurgery, London, UK.
Experimental Brain Research
|July 7, 2000
Summary
This study investigated the electrophysiological correlates of the go/nogo decision. Researchers identified an early negative brainwave component preceding muscle activity, suggesting it reflects the inhibition decision.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychophysiology
Background:
- The go/nogo task is a standard measure of volitional inhibition.
- Previous research focused on N2 and P3 event-related potentials (ERPs) for go/nogo decisions.
- EMG onset latency often precedes N2 and P3 potentials, indicating earlier neural events.
Purpose of the Study:
- To clarify the temporal relationship between cortical activity and motor responses in the go/nogo task.
- To identify early electrophysiological correlates of the nogo decision, specifically those occurring before electromyography (EMG) onset.
Main Methods:
- Concurrent recording of electroencephalography (EEG) and EMG activity.
- Utilized a modified S1-S2 paradigm with two decision stages.
- Formed difference ERPs by subtracting go ERPs from nogo ERPs to isolate nogo-specific components.
Main Results:
- An early negative component was detected before EMG onset in difference ERPs.
- This component was present in both go/nogo difference traces.
- The timing of this component corresponded roughly with the N1 wave.
Conclusions:
- The identified early negativity may represent a specific electrophysiological marker of the nogo decision itself.
- This finding suggests earlier cortical processes are involved in inhibition than previously emphasized by N2/P3 focus.
- Provides a more precise understanding of the neural underpinnings of response inhibition.