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Ipsilateral head and centring eye movements evoked from monkey premotor cortex.

Mathieu Boulanger1, André Bergeron, Daniel Guitton

  • 1Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.

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Stimulating a specific brain zone in monkeys triggers gaze and head movements, suggesting an avoidance response to threats. This research sheds light on defensive behaviors and neural pathways.

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Area of Science:

  • Neuroscience
  • Primate Behavior
  • Motor Control

Background:

  • A 'polysensory, defensive zone' in the ventral premotor cortex of monkeys has been identified.
  • Stimulation of this zone elicits coordinated multisegmental movements, similar to defensive reactions to threats.

Purpose of the Study:

  • To investigate gaze movements evoked by electrical stimulation of the polysensory zone in monkeys.
  • To understand the role of this zone in generating avoidance behaviors.

Main Methods:

  • Electrical stimulation of the polysensory zone in the ventral premotor cortex.
  • Recording gaze movements in both head-fixed and head-unrestrained monkeys.
  • Analyzing eye and head movements during stimulation.

Main Results:

  • Centring eye movements were consistently elicited at all stimulated sites and under both head conditions.
  • In head-unrestrained monkeys, ipsilateral head movements accompanied evoked eye movements.
  • Evoked gaze movements directed the animal's attention ipsilaterally, away from the perceived threat direction.

Conclusions:

  • Stimulation of the polysensory zone generates avoidance behaviors.
  • The ventral premotor cortex plays a crucial role in coordinating gaze and head movements for defensive responses.
  • These findings support the hypothesis that this neural zone mediates reactions to head-directed threatening stimuli.