PMID: 13475693Nov 20, 1957Paper

Input-output relation in a flexor reflex

The Journal of General Physiology
D P C LLOYD

Abstract

Observations have been made upon a typical flexor reflex with the aim of disclosing the changes in amount, latency, and temporal configuration of reflex discharge that take place as afferent input is varied from zero to maximal for the band of cutaneous myelinated afferent fibers that extends upward from approximately 6 micro in diameter (group II fibers). Reflex threshold is reached at 6 to 12 per cent maximal afferent input. From threshold to maximal input the relation between input and amount of output is essentially linear, latency on the average decreases, the shorter central paths in general gain preference, but the known minimum pathway, one of three neurons, does not transmit unless aided by convergent activity. Flexor reflex discharge may occur in several bursts suggesting the existence of closed chain connections in the internuncial pools of the spinal cord. At any given input there is, in successively elicited reflexes, little correlation between latency and amount of discharge, at first sight a surprising result for each variable can be taken as a measure of excitability status of the motoneuron population. However, latency of discharge indicates excitability at the beginning of the reflex event whereas amount of di...Continue Reading

References

Jul 20, 1955·The Journal of General Physiology·D P LLOYD, A K McINTYRE
Jul 20, 1955·The Journal of General Physiology·C C HUNT
Jan 20, 1957·The Journal of General Physiology·D P LLOYD, V J WILSON
Jan 20, 1957·The Journal of General Physiology·D P LLOYD

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Citations

Jun 1, 1972·Electroencephalography and Clinical Neurophysiology·Y Ben-Ari, G Le Gal la Salle
May 15, 1962·Proceedings of the National Academy of Sciences of the United States of America·D P LLOYD
Mar 1, 1975·Experimental Neurology·M H Clare, W M Landau

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