CEREBRAL RESPONSE OF ANTERIOR SIGMOID GYRUS TO IPSILATERAL POSTERIOR SIGMOID STIMULATION IN CAT

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Abstract
The electrical response evoked in the anterior sigmoid gyrus of the cat by ipsilateral posterior sigmoid stimulation was studied. A typical response consisted of a sequence of 4 surface-positive deflections (S, P1, P2, P3) and a surface-negative deflection (D) followed by a prolonged positive deflection (A). A series of rhythmic afterdischarges at a frequency of about 12/sec. often followed this primary response. It is suggested that component S is of incoming volley origin and the remaining components represent the product of postsynaptic activity within the cortex. It is also suggested that components P2 and P3 and the postsynaptic positive wave of the primary response, evoked by afferent nerve stimulation, are largely produced by the same cortical elements; and that component D is of similar origin as the surface-negative wave evoked by topical stimulation. Component A is considered to originate in part from the cortical elements producing the positive wave which follows the negative wave to topical stimulation.

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