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Related Concept Videos

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Related Experiment Video

Updated: Mar 27, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Saccadic Corollary Discharge Underlies Stable Visual Perception.

James Cavanaugh1, Rebecca A Berman2, Wilsaan M Joiner2

  • 1Laboratory of Sensorimotor Research, National Eye Institute, National Institutes of Health, Bethesda, Maryland 20892 jrc@lsr.nei.nih.gov.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 8, 2016
PubMed
Summary
This summary is machine-generated.

Visual stability relies on a brain signal called corollary discharge (CD). Inactivating the CD in monkeys disrupted their perception of eye direction, proving CD

Keywords:
FEFMDcorollary dischargeefference copymacaquevisual perception

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Area of Science:

  • Neuroscience
  • Vision Science
  • Perception

Background:

  • Saccadic eye movements cause retinal image displacement, yet visual perception remains stable.
  • A proposed mechanism for visual stability is the corollary discharge (CD), a neural signal mirroring eye movement commands.
  • The CD circuit's role in visual perception remains under investigation.

Purpose of the Study:

  • To investigate the influence of the CD circuit on visual perception.
  • To determine if the CD signal is essential for maintaining visual stability during saccades.

Main Methods:

  • Macaque monkeys were trained to report perceived eye direction.
  • The corollary discharge (CD) pathway was reversibly inactivated in the thalamus.
  • Perceived eye direction was compared to actual eye position during CD inactivation.

Main Results:

  • Inactivating the CD circuit decoupled perceived eye direction from actual eye position.
  • The perceived eye direction was not influenced by proprioceptive or contextual visual cues.
  • This demonstrates that the CD signal is critical for accurate perception of eye position.

Conclusions:

  • The corollary discharge (CD) provides crucial internal information for perceived visual stability.
  • The CD signal may serve as an internal saccade vector, integrating disparate retinal images.
  • This finding supports the hypothesis that CD is fundamental to maintaining a stable visual world.