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Related Concept Videos

Vision01:24

Vision

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Always expect the unexpected: eye position modulates visual cortex excitability in a stimulus-free environment.

Matthieu M de Wit1, Olufunsho Faseyitan1, H Branch Coslett1

  • 1Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States.

Journal of Neurophysiology
|April 3, 2024
PubMed
Summary

This study shows that eye position influences visual cortex excitability, enhancing detection of peripheral stimuli. This brain mechanism, termed "surveillance attention," helps monitor environments for potential threats.

Keywords:
TMSadaptive mechanismcortical excitabilitysurveillance attentionvisual cortex

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Perception

Background:

  • Rapid defensive actions are crucial for survival in unpredictable natural environments.
  • Previous research indicated motor cortex excitability changes with gaze direction.
  • A fundamental neural mechanism may modulate cortical excitability based on gaze location.

Purpose of the Study:

  • To investigate if visual cortex excitability is modulated by eye position.
  • To test the hypothesis that gaze-dependent cortical excitability extends beyond motor areas.
  • To explore the neural basis of monitoring peripheral environments.

Main Methods:

  • Applied single-pulse transcranial magnetic stimulation (TMS) to the right lateral occipital lobe.
  • Participants directed their eyes to the left, straight-ahead, or to the right.
  • Recorded phosphene perception to assess visual cortex excitability.

Main Results:

  • Visual cortex excitability was significantly greater when eyes were deviated to the right compared to the left.
  • Phosphene elicitation varied with eye position, indicating gaze-dependent modulation.
  • This finding complements previous motor cortex excitability changes related to gaze alignment.

Conclusions:

  • Eye position directly modulates visual cortex excitability.
  • This mechanism likely facilitates the detection of stimuli in non-foveated space.
  • The findings support the concept of 'surveillance attention' for monitoring peripheral environments.