The suprasylvian gyrus of cats was systematically mapped by recording acoustic and somatosensory-evoked potentials under pentobarbital and chloralose anaesthesia. In this way two polysensory systems could be differentiated. One of them operates only under chloralose anaesthesia and proved to be identical with the long latency association fields: the anterior middle suprasylvian association area and the posterior middle suprasylvian association area, discovered by Thompson, Johnson & Hopes (1963). The other one is localized to the anterior suprasylvian gyrus and exhibits short latency-evoked potentials and is also active under pentobarbital anaesthesia. The incorporation of [3H]-glycine, as demonstrated by autoradiography, showed good correspondence with the electrophysiological findings and so provides a morphological way of localising the two polysensory systems.
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