Abstract
Observations on the effect of mechanical vibration on the patellar reflex of the cat confirm those of previous investigators in that such vibration, applied directly or indirectly to the quadriceps femoris, produces an inhibition. However, this inhibition is found to be independent of the autonomic nervous system. Evidence is presented for the concept that mechanical vibration acts by preempting the stretch reflex pathway. As a function of frequency of vibration, the inhibition appears between 10 and 30 cps. and fades out between 300 and 600 cps. with the apparatus used.

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