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Related Experiment Video

Updated: Dec 26, 2025

Corticospinal Excitability Modulation During Action Observation
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Ever-ready for action: Spatial effects on motor system excitability.

Matthieu M de Wit1, Olufunsho Faseyitan2, H Branch Coslett2

  • 1Department of Neuroscience, Muhlenberg College, Allentown, PA, USA.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|March 16, 2020
PubMed
Summary

Motor system excitability changes with hand position and gaze direction, even without movement instructions. Increased excitability when looking away suggests a "surveillance attention" mechanism enhancing readiness for unexpected events.

Keywords:
Action readinessCortical gainHemispaceMotor attentionMotor systemSpatial attentionSurveillance attentionTMS

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Neuroscience

Background:

  • Motor system excitability can change before overt movements or covert motor intentions.
  • Previous research indicates motor system responses to implicit cues.

Purpose of the Study:

  • To investigate if motor cortex excitability is modulated by hand position relative to the body midline, independent of explicit motor instructions.
  • To explore the influence of gaze direction (towards or away from the hand) on motor cortex excitability.

Main Methods:

  • Participants underwent single-pulse Transcranial Magnetic Stimulation (TMS) over the motor cortex.
  • Hand position (left or right of body midline) and gaze direction were manipulated.
  • Motor cortex excitability was measured via TMS responses.

Main Results:

  • Greater motor cortex excitability was observed when participants gazed to the right, potentially linked to left-hemisphere motor attention.
  • Contrary to hypotheses, excitability was higher when participants looked away from their hand.
  • This suggests a 'surveillance attention' mechanism increasing cortical gain in non-foveated space.

Conclusions:

  • Motor cortex excitability is influenced by spatial attention and hand location, even without overt motor tasks.
  • The concept of 'surveillance attention' is proposed to explain increased excitability when looking away, enhancing readiness for peripheral stimuli.
  • This mechanism may have evolutionary advantages for detecting unexpected environmental threats.