A SECONDARY ACOUSTIC AREA IN THE CEREBRAL CORTEX OF THE CAT

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Abstract
After oscillographic mapping (10 cats) of the cortical area responsive to audible click stimulation, strychnine sulfate was applied to the region so defined, after which potentials were evoked from a hitherto silent area on the posterior ectosylvian gyrus by the same stimulus. The response from the 2d area was similar to that of the primary projection area and could be eliminated by decortication of the primary area or by cutting into the white matter underlying the strip of cortex separating the two. It is concluded that, despite disagreement with previous accounts of the differentiation in the temporal cortex of the cat, the evidence presented indicates a secondary acoustic area occupying the posterior ectosylvian gyrus.

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