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Muscimol and baclofen differentially suppress retinotopic and nonretinotopic responses in visual cortex

Published online by Cambridge University Press:  03 February 2006

TAKUJI KASAMATSU ,
KEIKO MIZOBE  and
ERICH E. SUTTER
TAKUJI KASAMATSU
Affiliation:
The Smith-Kettlewell Eye Research Institute, San Francisco, California
KEIKO MIZOBE
Affiliation:
The Smith-Kettlewell Eye Research Institute, San Francisco, California Present address: Keiko Mizobe, Department of Ophthalmology, Kyoto Prefectural University of Medicine, Kamigyo-ku, Kyoto, 602-8566 Japan
ERICH E. SUTTER
Affiliation:
The Smith-Kettlewell Eye Research Institute, San Francisco, California
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Abstract

This study relates to local field potentials and single-unit responses in cat visual cortex elicited by contrast reversal of bar gratings that were presented in single, double, or multiple discrete patch (es) of the visual field. Concurrent stimulation of many patches by means of the pseudorandom, binary m-sequence technique revealed interactions between their respective responses. An analysis identified two distinct components of local field potentials: a fast local component (FLC) and a slow distributed component (SDC). The FLC is thought to be a primarily postsynaptic response, as judged by its relatively short latency. It is directly generated by thalamocortical volleys following retinotopic stimulation of receptive fields of a small cluster of single cells, combined with responses to recurrent excitation and inhibition derived from the cells under study and immediately neighboring cells. In contrast, the SDC is thought to be an aggregate of dendritic potentials related to the long-range lateral connections (i.e. long-range coupling). We compared the suppressive effects of a GABAA-receptor agonist, muscimol, on the FLC and SDC with those of a GABAB-receptor agonist, baclofen, and found that muscimol more strongly suppressed the FLC than the SDC, and that the reverse was the case for baclofen. The differential suppression of the FLC and SDC found in the present study is consistent with the notion that intracortical electrical signals related to the FLC terminate on the somata and proximal/basal dendrites, while those related to the SDC terminate on distal dendrites.

Keywords

Long-range lateral interactionsGABAA- and GABAB-receptorsFast local potentialsSlow distributed potentialsBinary m-sequenceMulti-input nonlinear systems analysisCat striate cortex
Type
Research Article
Information
Visual Neuroscience , Volume 22 , Issue 6 , November 2005 , pp. 839 - 858
Copyright
© 2005 Cambridge University Press

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