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Spatial integration and cortical dynamics

C D Gilbert1, A Das, M Ito

  • 1Rockfeller University, New York, NY 10021-6399, USA.

Proceedings of the National Academy of Sciences of the United States of America
|January 23, 1996
PubMed
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Adult visual cortex integrates more visual information than previously believed, with receptive fields adaptable through experience. Long-range horizontal connections are key to this plasticity and visual processing.

Area of Science:

  • Neuroscience
  • Visual Cortex Research
  • Cortical Plasticity

Background:

  • Cells in the adult primary visual cortex integrate information across larger visual fields than previously understood.
  • Receptive field properties are modifiable by visual context and experience.

Purpose of the Study:

  • To investigate the role of long-range horizontal connections in spatial integration and cortical plasticity.
  • To explore the functional consequences of lateral interactions in the visual cortex.
  • To understand the mechanisms underlying short-term and long-term plasticity in receptive fields.

Main Methods:

  • Optical recording to visualize lateral interactions within the striate cortex.
  • Human psychophysical experiments and recordings from alert monkeys using comparable stimuli.

Related Experiment Videos

  • Induction of cortical remapping via focal binocular retinal lesions.
  • Observation of receptive field plasticity following brief visual stimulation.

    • Main Results:

    • Long-range horizontal connections (6-8 mm) link cells within cortical areas, likely serving as the substrate for spatial integration and plasticity.
    • Lateral interactions contribute to visual segmentation, illusory contours, surface fill-in, and contour saliency.
    • Receptive field properties exhibit dynamic changes over time scales from seconds to months.
    • Short-term plasticity involves altering existing connection effectiveness; long-term plasticity involves axonal sprouting and synaptogenesis.

    Conclusions:

    • The adult visual cortex demonstrates significant plasticity, influenced by sensory experience throughout life.
    • Long-range horizontal connections are crucial for visual processing, perceptual phenomena, and adaptive recalibration.
    • This plasticity represents a mechanism for continuous calibration of visual perception and perceptual learning.