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J. FXDUNE JAMES B. PRESTON PZ-lysioEogy, York 13210 State University hTew York Upstate Medical Center, THE COURSE a recent investigation (7) on the patterns motor cortex effects on cat innervating muscle spindles in ankle flexor extensor muscles, the nature inhibitory modulation spontaneous activity was studied in some detail. Virtually all the cortically inhibited units isolated exhibited a resting discharge. The resting discharge was regular in many these units; the interval between responses varying less than 10 . These units with nearly constant discharge frequency were selected to study inhibitory modulation resting discharge. It was demonstrated that either segmental or corticalevoked inhibition spontaneous activity produced predictable alterations in the pattern frequency background activity, which was dependent on the frequency the stimulus evoking inhibitory driving. The observed alterations in discharge patter n were found to be attribut able to the rhythm by the inhibitory event. Although a regular discharge rhythm by an excitatory event, i.e., an action potential, is well known, especially in the mammalian heart, inhibitory does not appear to have been widely recognized. A similar phenomenon has recently been reported in invertebrates (17). The data presented in this report, coupled with similar observations in an invertebrate system, suggest
Journal of Neurophysiology – The American Physiological Society
Published: Mar 1, 1971
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