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Subliminal activity in the superior colliculus (SC) correlates with the visual grasp reflex, including muscle activity and pupil dilation. These covert orienting signs may offer new oculomotor biomarkers for health and disease.

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Area of Science:

  • Neuroscience
  • Oculomotor Systems
  • Systems Neuroscience

Background:

  • Oculomotor behavior is controlled by a distributed network of cortical and subcortical brain regions.
  • The superior colliculus (SC) plays a key role in coordinating ancient visual reflexes, including the visual grasp reflex.

Purpose of the Study:

  • To review recent findings on the correlation between subliminal SC activity and components of the visual grasp reflex.
  • To explore the potential of covert orienting manifestations as novel oculomotor biomarkers.

Main Methods:

  • Review of recent research correlating SC activity with visual grasp reflex components.
  • Analysis of subliminal SC activity in the absence of overt saccades.

Main Results:

  • Subliminal SC activity is linked to neck and limb muscle recruitment.
  • Covert orienting, indicated by pupil dilation and microsaccade propensity, is associated with subliminal SC activity.
  • These subtle oculomotor signals are detectable in the motor periphery.

Conclusions:

  • Subliminal SC activity is a significant indicator of the visual grasp reflex.
  • Manifestations of covert orienting, such as pupil dilation and muscle recruitment, can serve as valuable oculomotor biomarkers.
  • Future research may leverage these findings for diagnosing and monitoring various health conditions.