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J. C. R. F. l VV. D. â Physiology, The Australian National University, Canberra, (Received for publication December 6, 1962) Australia previous investigations on the the central terminals afferent fibers. One paper (10) reported a variety experimental observations designed to test the hypothesis that this central depressed the synaptic efficacy the afferent fibers. It was found in seven separate tests that the observed s synaptic depressions corresponded closely to the phenomena presynaptic inhibition that was originally defined in relation to group Ia afferent volleys from muscle (8, 12, 14, 18, 19). The presynaptic s were observed as dorsal root potentials (DRPâs), P waves from the dorsum the cord, field potentials within the cord. These s accounted in large part for the observed depressions synaptic excitation as tested by responses interneurons monosynaptically excited by volleys; more indirectly by the flexor reflex, the ipsilateral tract discharge, the dorsal root potential. In earlier investigations with recording by a microelectrode in afferent fibers within the spinal cord (11, 21), it had been shown that there was indeed a these fibers that corresponded to the electrotonically transmitted along dorsal root fibers, the dorsal root potential. In the present study a more corn .prehensive
Journal of Neurophysiology – The American Physiological Society
Published: Jul 1, 1963
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