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Related Experiment Videos

Stimulus-Dependent Neuronal Oscillations in Cat Visual Cortex: Inter-Columnar Interaction as Determined by

Andreas K. Engel1, Peter König, Charles M. Gray

  • 1Max-Planck-Institut für Hirnforschung, Abt. Neurophysiologie, Deutschordenstrasse 46, 6000 Frankfurt 71, FRG.

The European Journal of Neuroscience
|January 1, 1990
PubMed
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Neurons in the cat visual cortex synchronize their oscillatory responses across columns. This synchronization depends on cell properties and stimulus conditions, potentially forming neuronal assemblies.

Area of Science:

  • Neuroscience
  • Visual Cortex Function
  • Neuronal Oscillations

Background:

  • Neurons in the cat striate cortex exhibit 40-60 Hz oscillatory responses to preferred stimuli.
  • Prior evidence suggested synchronization of these oscillatory responses across cortical columns.

Purpose of the Study:

  • To extensively analyze the phenomenon of intercolumnar synchronization of neuronal oscillatory responses.
  • To investigate the stimulus conditions that elicit this synchronization.
  • To examine both unit and local field potential responses.

Main Methods:

  • Recorded multi-unit activity and local field potentials from cat area 17 using multi-electrode arrays.
  • Analyzed auto- and cross-correlation functions for unit (n=200) and field potential (n=174) recordings.

Related Experiment Videos

  • Quantified oscillatory modulation by fitting a damped sine wave (Gabor) function.

    • Main Results:

    • 90/200 unit recordings showed constant phase-relationship synchronization, often with no phase difference.
    • Synchronization occurred between cells with similar orientation preferences (non-overlapping receptive fields) and different preferences (overlapping receptive fields).
    • 136/174 field potential recordings showed synchronization, independent of orientation preference but decreasing with distance.

    Conclusions:

    • Oscillatory responses at separate cortical sites can transiently synchronize.
    • Synchronization probability and strength depend on spatial separation, orientation preference, and visual stimulus features.
    • This synchronization may serve as a mechanism for forming neuronal assemblies in the visual cortex.