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Superior Olive S Segmentâ JAMES CHIYEKO Veterans Administration Hospital Department of Pharmacology, University of Pittsburgh Medical School, Pittsburgh, Pennsylvania within the superior olivary complex which has been most extensively studied is the lateral superior olive or S segment (1 l,12). The cells within this nucleus are tonotopitally organized with low frequencies being represented in the dorsolateral limb high frequencies in the ventromedial limb. The cells are typically without spontaneous activity are excited almost exclusively by ipsilateral stimulation. Stable thresholds are common, discharge increases in a monotonic fashion up to a limiting plateau when stimulus intensity is raised above threshold. Ipsilateral stimulus parameters are not the sole determinants of S-segment discharge, however. In the first study on S-segment neurons, Galambos, Schwartzkopf, Rupert (2) observed that the ipsilaterally elicited discharge could be inhibited by the simultaneous presentation of a tone to the contralateral ear. Goldberg, Smith, Adrian (3) later reported in an abstract: cCFor many units of the lateral superior olivary nucleus, contralateral stimulation inhibited both spontaneous discharges discharges in response to ipsilatera1 stimulation, the degree of inhibition being systematically related to the frequency intensity of the stimuli delivered to the con tralateral ear.â In this report, this systematic relationship
Journal of Neurophysiology – The American Physiological Society
Published: May 1, 1968
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