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Related Concept Videos

Visual System01:26

Visual System

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.
Once through the pupil, the light passes through the lens, a...
Vision01:24

Vision

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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Neuronal mechanisms for visual stability: progress and problems.

Robert H Wurtz1, Wilsaan M Joiner, Rebecca A Berman

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

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|January 19, 2011
PubMed
Summary
This summary is machine-generated.

Stable vision during eye movements relies on a corollary discharge (CD) signal. Research in monkey brains investigates neuronal mechanisms for this visual stability, exploring attention and visual field influences.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Saccadic eye movements cause visual interruptions, posing a challenge to stable visual perception.
  • A major hypothesis suggests a corollary discharge (CD) signal compensates for eye motion by informing the brain of eye movement.
  • The monkey brain serves as a key model for understanding human visual system mechanisms.

Purpose of the Study:

  • To summarize evidence for a CD pathway to the frontal cortex in monkeys.
  • To explore the relationship between neuronal mechanisms in the monkey brain and stable visual perception.
  • To address key questions regarding the neural basis of visual stability.

Main Methods:

  • Review of existing evidence for corollary discharge pathways.
  • Analysis of neuronal activity in the monkey brain as a model system.
  • Consideration of four specific questions related to visual stability mechanisms.

Main Results:

  • Evidence for a corollary discharge pathway to the frontal cortex has been found in monkey brains.
  • The study frames key questions about how neuronal activity relates to stable vision.
  • The research considers the roles of attention, central visual field processing, and specific neural pathways (superior colliculus, pulvinar) in visual stability.

Conclusions:

  • Neuronal mechanisms in the monkey brain are being investigated as correlates of visual stability.
  • Understanding these mechanisms may elucidate how the brain compensates for saccadic eye movements.
  • Further research is needed to fully understand the contribution of pathways like the superior colliculus-pulvinar-visual cortex axis to visual stability.