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Correlations, feature-binding and population coding in primary visual cortex.

Huw D R Golledge1, Stefano Panzeri, Fashan Zheng

  • 1Department of Psychology, University of Newcastle-upon-Tyne, Medical School, Framlington Place, UK.

Neuroreport
|June 13, 2003
PubMed
Summary
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Neuronal firing rates, not correlations, primarily encode visual feature binding in the brain's primary visual cortex (V1). This finding challenges theories suggesting correlated activity is key for visual perception.

Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Visual Perception

Background:

  • The neural basis of visual feature binding remains a key question in neuroscience.
  • Theories propose that correlated neuronal activity or individual neuronal firing rates may underlie visual perception.

Purpose of the Study:

  • To investigate whether correlated neuronal activity or firing rates are the primary neuronal code for visual feature binding.
  • To quantify the contribution of firing rates and cross-correlations to visual information encoding in V1.

Main Methods:

  • Applied information theory techniques to multiunit activity recorded from V1 in anesthetized cats.
  • Presented single or separate bar stimuli to assess neuronal responses.
  • Quantified information carried by individual firing rates and cross-correlations between recording sites.

Related Experiment Videos

Main Results:

  • Firing rates carried the vast majority (89–96%) of visual information.
  • Correlations provided only a small additional information contribution (4–11%).
  • Neither correlation strength nor information systematically varied with Gestalt psychology-predicted perceptual changes.

Conclusions:

  • Neuronal firing rates, not correlations, are the principal component of the population code for feature binding in primary visual cortex.
  • This suggests a dominant role for rate coding in visual perception over correlation-based coding.