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Cerebral Cortex Advance Access published online on February 22, 2006
Cerebral Cortex, doi:10.1093/cercor/bhj145
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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

Waking-Sleep Modulation of Paroxysmal Activities Induced by Partial Cortical Deafferentation

Dragos A. Nita 1, Youssouf Cissé 1, Igor Timofeev 1, and Mircea Steriade 1 *

1 Laboratory of Neurophysiology, Faculty of Medicine, Laval University, Quebec, Canada G1K 7P4

* To whom correspondence should be addressed.
Mircea Steriade, E-mail: mircea.steriade{at}phs.ulaval.ca


  Abstract

We investigated the dependency of electrical seizures produced by cortical undercut upon behavioral states of vigilance in chronically implanted cats. Experiments were performed 1-12 weeks after white matter transection. Multisite field potentials and intracellular activity were recorded from suprasylvian and marginal gyri. Paroxysmal activity developed within days and consisted of spike-wave complexes at 3-4 Hz occurring during the waking state (correlated with eye movements), being enhanced during slow-wave sleep (SWS) and blocked during rapid eye movement (REM) sleep. Prolonged hyperpolarizing events were seen not only during SWS (which is the case in normal animals) but also during both waking and REM, thus resulting in bimodal distribution of the membrane potential in all 3 natural states of vigilance. The increased synchrony of field potential activity expressed by shorter time of propagation over the cortical surface and the tendency toward generalization are ascribed to changes in intrinsic neuronal properties and potential disinhibition following cortical undercut.

Keywords: cortical undercut; electrical seizures; field potentials; intracellular recordings; waking-sleep states.
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