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Related Experiment Videos

Synaptic plasticity in visual cortex: comparison of theory with experiment.

E E Clothiaux1, M F Bear, L N Cooper

  • 1Physics Department, Brown University, Providence, Rhode Island 02912.

Journal of Neurophysiology
|November 1, 1991
PubMed
Summary

The Bienenstock, Cooper, and Munro (BCM) theory models synaptic plasticity in the cortex. Computer simulations show BCM theory can replicate experience-dependent synaptic modifications, including kinetics and equilibrium states, under various visual conditions.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Synaptic Plasticity

Background:

  • Experience-dependent synaptic modifications are crucial for cortical function.
  • The Bienenstock, Cooper, and Munro (BCM) theory provides a framework for understanding synaptic plasticity.
  • A key feature of BCM theory is a sliding modification threshold (theta) that adapts to average postsynaptic response.

Purpose of the Study:

  • To evaluate if the BCM theory, with fixed parameters, can accurately model experience-dependent synaptic modifications in the cortex.
  • To compare theoretical predictions of BCM theory with experimental observations using computer simulations.

Main Methods:

  • Computer simulations of a model cortical neuron were used.
  • Synaptic weights were modified based on the BCM theory, which involves input activity and a sliding modification threshold.

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  • Simulations incorporated two types of geniculocortical input: correlated pattern input (visual contours) and uncorrelated noise input.

    • Main Results:

    • The study simulated various visual experiences, including normal vision, monocular deprivation, reverse suture, strabismus, and binocular deprivation.
    • BCM theory, with a fixed parameter set, demonstrated the ability to reproduce both the kinetics and equilibrium states of synaptic modifications.
    • The constraints imposed by different simulated visual environments on synaptic weight evolution were analyzed.

    Conclusions:

    • The Bienenstock, Cooper, and Munro (BCM) theory, with a consistent set of parameters, can effectively model the complex dynamics of experience-dependent synaptic modifications in the cortex.
    • The sliding modification threshold is a critical element enabling BCM theory to account for diverse forms of synaptic plasticity observed under different visual conditions.