Journal article

POSTSYNAPTIC POTENTIALS IN CAT VISUAL-CORTEX - DEPENDENCE ON POLARIZATION

M VOLGUSHEV, X PEI, TR VIDYASAGAR, OD CREUTZFELDT

NEUROREPORT | RAPID SCIENCE PUBLISHERS | Published : 1992

Abstract

During the investigation of visually evoked postsynaptic potentials (PSPs) of visual cortical neurons, we recorded cell activity under different levels of membrane potential. In some cases, however, dependence of these PSPs on the level of membrane polarization appears to be inconsistent with the conventional scheme. One disagreement was the reduction, instead of an increase, of excitatory potentials during hyperpolarization of the cell. The other point was that depolarization of the cell often leads to increase of the amplitude of both excitatory and inhibitory postsynaptic potentials. This inconsistency may suggest the involvement of voltage-dependent ion channels in generating PSPs to vis..

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