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Related Experiment Videos

Neural responses in cat visual cortex reflect state changes in correlated activity.

Chris van der Togt1, Henk Spekreijse, Hans Supèr

  • 1Vision and Cognition, The Netherlands Ophthalmic Research Institute, Meibergdreef 47, 1105BA Amsterdam, The Netherlands. c.vandertogt@ioi.knaw.nl

The European Journal of Neuroscience
|July 28, 2005
PubMed
Summary

Cortical state changes spontaneously in anesthetized cats, affecting sensory processing. Neural responses to stimuli are strongest when low-frequency brain rhythms increase and high-frequency rhythms decrease.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience

Background:

  • Cortical state is defined by ongoing rhythmic neural activity.
  • Spontaneous changes in cortical state occur even under anesthesia.
  • The impact of these state changes on sensory processing is not fully understood.

Purpose of the Study:

  • To investigate how spontaneous changes in cortical state affect sensory stimulus processing in the visual cortex.
  • To determine the relationship between rhythmic neural activity and stimulus-evoked responses.

Main Methods:

  • Recorded local field potentials and multi-unit neuronal activity (MUA) using trans-cortical electrode arrays in anesthetized cats.
  • Analyzed spontaneous and stimulus-evoked neural activity.
  • Quantified cortical state changes using cross-correlation and cross-coherency between MUA channels.

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Main Results:

  • Spontaneous changes in rhythmic neural activity were associated with altered stimulus-evoked multi-unit responses.
  • Maximal neural responses occurred during periods of increased low-frequency and decreased high-frequency electroencephalogram rhythms.
  • These state-dependent response changes were most pronounced in layer IV, the primary input layer of the visual cortex.

Conclusions:

  • Stimulus response magnitude in the visual cortex is dependent on the prevailing rhythmic cortical state.
  • These findings suggest that cortical state modulates functional connectivity within the visual cortex, influencing sensory processing.