Abstract
The effects of dc and ac stimulation, introduced in the basal turn across the organ of Corti [re Tasaki and Fernandez, J. Neurophysiol. (1952)] on the discharges of 144 units recorded with pipet electrodes in the modiolus [Tasaki, J. Neurophysiol. (1954)] were measured during systematic variation of electrical and acoustic parameters. Data, recorded on tape, were analyzed by computing latency and interval histograms. Tasaki and Fernandez [ibid.] reported that V/T polarization (scala vestibuli positive re scala tympani) produced an increase of cochlear microphonic and action potential, while T/V showed a decrease. Our results show that the electric current always altered the discharge rate of primary fibers when their best frequency was greater than 3000 Hz, but the direction of the alteration varied between fibers and depended on the parameters of both acoustic and electric inputs. The rate of spontaneous discharges was also modified but the direction of the change in discharge rate was not always the same as the effect on the evoked discharges. [Partially supported by NIH.]
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