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Cerebral Cortex Advance Access published online on January 4, 2006
Cerebral Cortex, doi:10.1093/cercor/bhj110
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© The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Article

Strabismic Suppression Is Mediated by Inhibitory Interactions in the Primary Visual Cortex

Frank Sengpiel 1 *, Kay-Uwe Jirmann 2, Vasily Vorobyov 1, and Ulf T. Eysel 2

1 Cardiff School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3US, UK
2 Department of Neurophysiology, Ruhr-University Bochum, D-44780 Bochum, Germany

* To whom correspondence should be addressed.
Frank Sengpiel, E-mail: SengpielF{at}cf.ac.uk


  Abstract

Most strabismic observers do not suffer from double vision because of suppression from conscious perception of 1 of the 2 eyes' conflicting views. Direct evidence for the site and neural substrate of strabismic suppression has not been available so far, although psychophysical data suggest a cortical origin. On the other hand, cross-orientation suppression among conflicting stimuli presented monocularly has recently been shown to have a strong thalamic component. Here we present evidence, using both visual stimulation and pharmacological techniques, that strabismic suppression occurs in the primary visual cortex and involves {gamma}-amino butyric acid (GABA)-mediated inhibition. We show that its dependency on the drift rate of the suppressing stimulus is consistent with a cortical origin; unlike monocular cross-orientation suppression, it cannot be evoked by very fast-moving stimuli. Furthermore, strabismic suppression is greatly reduced when GABAergic inhibition is locally blocked by the GABAA antagonist bicuculline.

Keywords: GABA; inhibition; orientation; strabismus; striate cortex.
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