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Related Experiment Video

Updated: Jun 4, 2025

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Does the stop-signal P3 reflect inhibitory control?

Mario Hervault1, Cheol Soh1, Jan R Wessel1

  • 1Department of Psychological and Brain Sciences, University of Iowa, Iowa City, IA, USA; Department of Neurology, University of Iowa Hospitals and Clinics, Iowa City, IA, USA; Cognitive Control Collaborative, University of Iowa, Iowa City, IA, USA.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|January 4, 2025
PubMed
Summary
This summary is machine-generated.

The stop-signal P3, an EEG measure, is re-evaluated as an index of inhibitory control in action-stopping. New evidence suggests it reflects a specific inhibitory process crucial for stopping actions.

Keywords:
Action stoppingCognitive controlInhibitory controlResponse inhibitionStop-signal P3Stop-signal task

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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Neurophysiology

Background:

  • Action-stopping is crucial for adaptive behavior and studied via inhibitory control.
  • The frontocentral stop-signal P3 (event-related potential from EEG) has been a proposed neurophysiological index of inhibitory control.
  • Recent challenges question the P3's utility as a direct index of inhibitory control.

Purpose of the Study:

  • Critically review evidence linking stop-signal P3 to inhibitory control.
  • Evaluate criticisms against the P3 as an inhibitory control index.
  • Propose an updated view of the processes reflected by the stop-signal P3.

Main Methods:

  • Comprehensive literature review spanning three decades.
  • Replication of key empirical patterns in a large EEG dataset (N=255).
  • Examination and evaluation of criticisms regarding P3 as an inhibitory control index.

Main Results:

  • Evidence supporting the link between stop-signal P3 and inhibitory control was reviewed.
  • Replication in a large dataset confirmed previous findings.
  • Criticisms were evaluated, suggesting nuanced interpretations.

Conclusions:

  • The stop-signal P3 indexes a specific, selective inhibitory control process.
  • This process critically contributes to successful action-stopping.
  • An updated view clarifies the P3's role and resolves ongoing debates.