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Trunk-ocular reflex in man.

T Warabi1

  • 1Department of Physiology, Hokkaido University School of Medicine, Sapporo, 060, Japan.

Neuroscience Letters
|July 17, 2009
PubMed
Summary
This summary is machine-generated.

Twisting the trunk while the head is fixed causes the eyes to move horizontally in the opposite direction. This trunk-ocular reflex, accompanied by nystagmus, demonstrates a connection between body rotation and eye motion.

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Vestibular System

Background:

  • The vestibulo-ocular reflex (VOR) stabilizes gaze during head movements.
  • The trunk-ocular reflex (TOR) describes eye movements in response to trunk motion.

Purpose of the Study:

  • To investigate if trunk twisting can induce horizontal eye movements in humans.
  • To quantify the characteristics of this trunk-induced ocular response.

Main Methods:

  • Subjects' heads and necks were immobilized.
  • Participants sat in a chair rotated sinusoidally around the vertical axis at 0.25 Hz.
  • Horizontal eye deviation and nystagmus were recorded.

Main Results:

  • Trunk twisting induced horizontal eye deviation counter to the trunk's rotation.
  • This ocular movement was consistently accompanied by nystagmus.
  • The gain of the trunk-ocular reflex was approximately 0.5, with a time lag of about 80 milliseconds.

Conclusions:

  • The human trunk-ocular reflex is a verifiable physiological response.
  • This reflex demonstrates a sensory-motor pathway linking trunk rotation to compensatory eye movements.
  • The quantified gain and latency provide insights into the reflex's efficiency and neural processing time.