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Corticospinal Excitability Modulation During Action Observation
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Corticospinal excitability is modulated by temporal feedback gaps.

Takako Suzuki1, Makoto Suzuki2, Toyohiro Hamaguchi1

  • 1School of Health Sciences, Saitama Prefectural University.

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|October 20, 2018
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Summary

Temporal feedback gaps increase corticospinal excitability (CE) during motor preparation. This heightened excitability adapts over time in goal-directed movements.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Accurate goal-directed movement relies on sensorimotor integration.
  • Corticospinal excitability (CE) influences motor preparation and execution.
  • Temporal feedback discrepancies can impact motor control strategies.

Purpose of the Study:

  • To investigate the effect of temporal feedback gaps on corticospinal excitability during the motor preparation period.
  • To understand how the brain adapts CE in response to altered sensory feedback during movement.

Main Methods:

  • Participants performed a goal-directed movement task with and without a 400ms temporal feedback delay.
  • Transcranial magnetic stimulation (TMS) was used to measure motor-evoked potentials (MEPs) in the first dorsal interosseous muscle.
  • MEPs were recorded during the motor preparation phase, timed relative to auditory cues.

Main Results:

  • Motor-evoked potential amplitudes were significantly higher in trials with temporal feedback gaps compared to normal feedback.
  • A gradual decrease in MEP amplitudes was observed over trials with temporal feedback gaps, indicating adaptation.
  • MEP amplitudes in trials without feedback gaps remained stable throughout the experiment.

Conclusions:

  • Temporal feedback gaps enhance corticospinal excitability during motor preparation.
  • The nervous system adapts to temporal discrepancies, leading to a reduction in this heightened excitability over time.
  • These findings highlight the dynamic interplay between sensory feedback and motor system excitability.