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Retinotopic and nonretinotopic field potentials in cat visual cortex

Published online by Cambridge University Press:  02 June 2009

M. Kitano ,
K. Niiyama ,
T. Kasamatsu ,
E. E. Sutter  and
A. M. Norcia
M. Kitano
Affiliation:
The Smith-KettlewellEye Research Institute, San Francisco
K. Niiyama
Affiliation:
The Smith-KettlewellEye Research Institute, San Francisco
T. Kasamatsu
Affiliation:
The Smith-KettlewellEye Research Institute, San Francisco
E. E. Sutter
Affiliation:
The Smith-KettlewellEye Research Institute, San Francisco
A. M. Norcia
Affiliation:
The Smith-KettlewellEye Research Institute, San Francisco
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Abstract

Two types of field potentials were identified in cat visual cortex using contrast reversal of oriented bar gratings: a short-latency fast-local component with a retinotopic organization similar to that seen with single-unit discharges at the same cortical site, and a slow, nonretinotopic component with a longer peak latency. The slow-distributed component had an extensive receptive field mapped by measuring the amplitude of binary kernels and showed strong inhibitory interactions within the receptive field. The peak latency of the slow-local component increased with distance from the retinotopic center, suggesting a possible conduction delay. Both components showed some orientation bias depending on the laminar location, but the bias could be independent of the orientation preferred by single units in the immediate vicinity. The present findings indicate that locally generated field potentials reflect cortical mechanisms for nonlinear integration over wide areas of the visual field.

Keywords

Contrast-reversal potentialMulti-input systems analysisLong-range lateral connectionsNonlinear inhibitory interactions
Type
Research Articles
Information
Visual Neuroscience , Volume 11 , Issue 5 , September 1994 , pp. 953 - 977
Copyright
Copyright © Cambridge University Press 1994

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