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Updated: Jan 19, 2026

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Multimodal stimuli modulate rapid visual responses during reaching.

Isabel S Glover1, Stuart N Baker1

  • 1Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, United Kingdom.

Journal of Neurophysiology
|September 12, 2019
PubMed
Summary
This summary is machine-generated.

Researchers found that rapid visual responses (RVRs) in arm muscles can assess brain stem excitability. Stimulating the median nerve, vestibular system, or auditory system noninvasively modulated these RVRs, indicating potential for new diagnostic tools.

Keywords:
brain stemreachingreticulospinalsuperior colliculus

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Physiology

Background:

  • The reticulospinal tract is crucial for upper limb control in primates.
  • Current methods for assessing reticulospinal tract activity are limited.
  • Rapid visual responses (RVRs) in arm muscles during visually cued reaching tasks are a potential indicator of tecto-reticulospinal pathway activity.

Purpose of the Study:

  • To investigate if RVRs can be used to noninvasively assess changes in reticulospinal excitability.
  • To determine if RVRs can be modulated by stimuli known to activate the reticular formation.

Main Methods:

  • Healthy human subjects performed visually cued reaching movements.
  • Surface electromyogram (EMG) recorded deltoid muscle activity.
  • Electrical median nerve stimulation, galvanic vestibular stimulation, or loud auditory stimuli were paired with visual targets.

Main Results:

  • Median nerve, vestibular, and auditory stimuli consistently facilitated RVRs.
  • These stimuli also reduced the latency of RVRs.
  • Facilitation occurred when stimuli were delivered up to 200 ms before target appearance.

Conclusions:

  • RVR amplitude can be used to noninvasively assess changes in brain stem excitability.
  • The observed facilitation reflects modulation of tecto-reticulospinal excitability.
  • This study provides a novel noninvasive method for evaluating reticulospinal function.