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Related Experiment Video

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Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation
12:09

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Published on: June 14, 2014

Stopping speech suppresses the task-irrelevant hand.

Weidong Cai1, Caitlin L Oldenkamp, Adam R Aron

  • 1Department of Psychology, University of California, San Diego, La Jolla, CA 92093, USA.

Brain and Language
|December 31, 2011
PubMed
Summary
This summary is machine-generated.

Stopping speech rapidly suppresses motor activity in the unrelated hand. This broad motor system suppression suggests a global inhibitory mechanism underlies response control, impacting speech and potentially stuttering.

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Last Updated: May 26, 2026

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Area of Science:

  • Neuroscience
  • Motor Control
  • Speech Science

Background:

  • Rapid response stopping involves a diffuse mechanism affecting the motor system.
  • Stopping hand movements suppresses excitability in the unrelated leg.
  • The extent of this 'global suppression' across different motor modalities is not fully understood.

Purpose of the Study:

  • To investigate if stopping speech induces suppression in the task-irrelevant hand.
  • To determine if a broad suppression mechanism operates across motor systems during speech cessation.

Main Methods:

  • Utilized Transcranial Magnetic Stimulation (TMS) over the primary motor cortex.
  • Measured electromyography (EMG) from the hand concurrently with TMS.
  • Compared motor evoked potentials (MEPs) in the hand during successful speech stopping versus failed stops and control conditions.

Main Results:

  • Successfully stopping speech significantly reduced hand motor evoked potentials.
  • This suppression was evident compared to failed speech stops, non-stop signal trials, and baseline conditions.
  • Demonstrated a broad suppression effect across the motor system when speech is rapidly stopped.

Conclusions:

  • Rapid speech stopping engages a widespread motor suppression mechanism.
  • This finding has significant implications for understanding the neural basis of speech control.
  • The results may offer insights into the mechanisms underlying speech disorders like stuttering.