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Penicillin Iontophoresis in Neocortex of Cat: Effects on the Spontaneous and Induced Activity of Single Neurons

1 Iontophoretic application of penicillin was carried out in an attempt to study the effects of this epileptogenetic agent upon individual neurons of the cerebral cortex of cats. 2 In the course of this procedure no classical PDSs were observed. The firing characteristics of the unit cell both in the resting condition and in response to VL stimulation were, however, reversibly modified and, especially with the latter procedure, ESPSs were considerably enhanced. 3 Hypothetically, these changes could be explained by membrane swelling and increased sodium conductance. 4 A population of cells appears to be necessary for the development of the typical PDS but the epileptogenic agent seems to have the property of inducing larval forms of PDS when its application is limited to an individual element. This would suggest a possible direct effect of the agent upon the synaptic terminals or the cell membrane.