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Active vision in parietal and extrastriate cortex.

Elisha P Merriam1, Carol L Colby

  • 1Department of Neuroscience and Center for the Neural Basis of Cognition, University of Pittsburgh, 15213, USA. eli@cnbc.cmu.edu

The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry
|September 10, 2005
PubMed
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Vision relies on constructing representations, not direct sight. Eye movements are compensated by updating internal spatial maps, maintaining perceptual stability.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Vision is an active, constructive process, not direct perception.
  • Perceptual stability requires integrating sensory input with internal signals, like movement commands.
  • Constant eye movements necessitate mechanisms to maintain a stable visual world representation.

Purpose of the Study:

  • To investigate the neural mechanisms underlying spatial updating during eye movements.
  • To test the hypothesis that corollary discharge updates internal spatial representations.
  • To identify brain regions involved in maintaining visual stability.

Main Methods:

  • Review of existing neuroscientific evidence from human and animal studies.
  • Analysis of studies examining parietal cortex and extrastriate visual areas.

Related Experiment Videos

  • Focus on neural correlates of spatial updating and remapping.

    • Main Results:

    • Evidence suggests parietal cortex and extrastriate visual areas are crucial for spatial updating.
    • These brain regions appear to remap internal representations based on eye movement commands.
    • Support for the corollary discharge hypothesis in maintaining visual stability.

    Conclusions:

    • A corollary discharge mechanism updates internal spatial representations during eye movements.
    • Parietal and extrastriate visual areas play a key role in achieving perceptual stability.
    • This research clarifies neural circuitry for a coherent perception of visual space.