. A text-book of human physiology . of summation. Thus Kronecker and Xikolaides found on stimulating the vasomotor centerthat single induction shocks of great strength produced but slight effect, and. Fig. —Reflex contractions of a leg to electrical stimulation, after Stirling. To be readfrom left to right. The middle line shows the time of stimulation; the lower hne is a timerecord in seconds. that repeated shocks of moderate strength and high frequency (optimum twentyto thirty per second) were more efficacious than stronger shocks at a lowerfrequency. Exactly the same thing is obs
. A text-book of human physiology . of summation. Thus Kronecker and Xikolaides found on stimulating the vasomotor centerthat single induction shocks of great strength produced but slight effect, and. Fig. —Reflex contractions of a leg to electrical stimulation, after Stirling. To be readfrom left to right. The middle line shows the time of stimulation; the lower hne is a timerecord in seconds. that repeated shocks of moderate strength and high frequency (optimum twentyto thirty per second) were more efficacious than stronger shocks at a lowerfrequency. Exactly the same thing is observed in reflex stimulation. It is extremelydifficult to get any response from a normal spinal cord with single inductionshocks (Setschenow). (Biedermann obsers^ed, however, that the responses areeasily obtained, if the spinal cord first be cooled.) But if the afferent nerve bestimulated with rapidly repeated shocks, no difficulty is experienced, and witha given strength of current the muscular responses appear more promptly themore frequent the stimuli. This is not because a larger number of stimuli fallwithin the latent period with the higher frequency; for the absolute number ofstimuli re
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