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Related Experiment Videos

Long-term changes in synaptic strength along specific intrinsic pathways in the cat visual cortex

J A Hirsch1, C D Gilbert

  • 1Laboratory of Neurobiology, Rockefeller University, New York, NY 10021.

The Journal of Physiology
|February 1, 1993
PubMed
Summary

Long-term changes in synaptic strength were observed in the cat

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Area of Science:

  • Neuroscience
  • Visual Cortex Research
  • Synaptic Plasticity

Background:

  • Horizontal connections in the striate cortex integrate visual information.
  • Understanding long-term synaptic plasticity is crucial for visual processing.

Purpose of the Study:

  • Investigate long-term changes in horizontal connection strength.
  • Examine how synaptic changes affect interlaminar input integration.

Main Methods:

  • Intracellular recordings from adult cat visual cortex slices.
  • Stimulation of horizontal fibers and interlaminar pathways.
  • Conditioning protocols involving repetitive stimulation and current pulses.

Main Results:

  • Long-term facilitation of monosynaptic excitatory postsynaptic potentials (EPSPs) observed in 60% of cells.

Related Experiment Videos

  • Facilitation enhanced polysynaptic components most significantly.
  • Conditioning induced lasting depression in some multisynaptic components.
  • Synaptic changes were typically pathway-specific, with occasional heterosynaptic effects.

    • Conclusions:

    • Synaptic plasticity in horizontal connections can be modulated long-term.
    • Observed synaptic changes may underlie dynamic receptive field properties.
    • Demonstrates a mechanism for adapting visual processing based on experience.