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Related Experiment Videos

Spontaneously emerging direction selectivity maps in visual cortex through STDP.

Oliver G Wenisch1, Joachim Noll, J Leo van Hemmen

  • 1Leibniz-Rechenzentrum, Barer Strasse 21, 80333 München, Germany. oliver.wenisch@ph.tum.de

Biological Cybernetics
|October 1, 2005
PubMed
Summary

Directional selectivity in the visual cortex emerges from intracortical connections. Spike-timing-dependent plasticity in recurrent networks naturally develops this direction preference, mimicking experimental findings.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Visual Processing

Background:

  • The generation of direction-selective neuronal responses in the primary visual cortex is debated, with feedforward thalamocortical and recurrent intracortical connections as potential mechanisms.
  • Understanding the developmental origins of direction selectivity is crucial for comprehending visual information processing.

Purpose of the Study:

  • To investigate the role of intracortical circuits and spike-timing-dependent synaptic plasticity in the development of direction selectivity.
  • To model how direction selectivity emerges in a recurrent network of spiking neurons.

Main Methods:

  • Developed a recurrent network model of the visual cortex using spiking neurons.
  • Simulated the effects of unidirectionally moving bar stimuli and intrinsic spontaneous activity on synaptic plasticity.

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  • Investigated the role of spatial asymmetries in synaptic contact distribution and weights.

    • Main Results:

    • Directional responses emerged in the model due to asymmetric receptive fields created by directional input integration.
    • Spike-timing-dependent plasticity with an asymmetric learning window naturally developed coupling asymmetries, leading to direction selectivity.
    • The model successfully reproduced direction preference maps consistent with experimental observations.

    Conclusions:

    • Recurrent intracortical connections, shaped by spike-timing-dependent plasticity, are sufficient for generating direction selectivity in the visual cortex.
    • The model provides a plausible mechanism for the developmental emergence of direction preference maps.