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Covert oculo-manual coupling induced by visually guided saccades.

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  • 1Department of Clinical and Experimental Sciences and National Institute of Neuroscience, University of Brescia Brescia, Italy.

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|October 18, 2013
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Summary

Eye and arm movements share a common neural pathway. Saccade execution (fast eye movements) alters upper-limb corticospinal excitability, suggesting a shared motor control system for gaze and limb actions.

Keywords:
eye-hand couplingmotor evoked potentialsmotor excitabilitysaccadetranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Physiology

Background:

  • Gaze and limb movements are coordinated during visually guided actions.
  • Evidence suggests shared neural controllers for eye and limb motor systems.
  • The interplay between ocular and manual motor control remains an active area of research.

Purpose of the Study:

  • To investigate if saccade execution influences the excitability of the upper-limb corticospinal system (CSS).
  • To determine if this influence occurs even without a concurrent manual response.
  • To provide evidence for a common neural drive coordinating eye and arm movements.

Main Methods:

  • Single-pulse transcranial magnetic stimulation (TMS) was applied to the motor cortex.
  • Motor evoked potentials (MEPs) were recorded from contralateral hand and wrist muscles.
  • Participants performed visually guided saccades to peripheral targets at varying delays following TMS.

Main Results:

  • Saccade execution led to significant changes in upper-limb CSS excitability.
  • MEP amplitude peaked shortly after saccade completion and decreased over time.
  • Muscle-specific MEP modulation varied with target location and TMS timing, consistent with arm motor programming.

Conclusions:

  • Fast eye movements modulate corticospinal excitability of the upper limb.
  • These findings support the existence of a common neural drive for coordinating gaze and arm motor systems.
  • The results suggest shared neural resources facilitate goal-directed eye and hand movements.