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Intracortical connections are not required for oscillatory activity in the visual cortex

Published online by Cambridge University Press:  02 June 2009

Geoffrey M. Ghose and
Ralph D. Freeman
Geoffrey M. Ghose
Affiliation:
Group in Vision Science, School of Optometry, University of California, Berkley
Ralph D. Freeman
Affiliation:
Group in Vision Science, School of Optometry, University of California, Berkley
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Abstract

arises from the integration of signals from strongly oscillatory cells within the LGN. The model also predicts the incidence of 50-Hz oscillatory cells within the cortex. Oscillatory discharge around 30 Hz is explained in a second model by the presence of intrinsically oscillatory cells within cortical layer 5. Both models generate spike trains whose power spectra and mean firing rates are in close agreement with experimental observations of simple and complex cells. Considered together, the two models can largely account for the nature and incidence of oscillatory discharge in the cat's visual cortex. The validity of these models is consistent with the possibility that oscillations are generated independently of intracortical interactions. Because these models rely on intrinsic stimulus-independent oscillators within the retina and cortex, the results further suggest that oscillatory activity within the cortex is not necessarily associated with the processing of high-order visual information.

Keywords

LGNVisual cortexSynchronyOscillationsGeniculocortical integrationDischarge statisticsCoding

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Type
Reprint
Information
Visual Neuroscience , Volume 14 , Issue 6 , November 1997, pp. 963R - 979R
Copyright
Copyright © Cambridge University Press 1997

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