Abstract
In a model of intracochlear electrical stimulation, an integrated Gaussian function defines the probability of auditory‐nerve‐fiber discharge versus stimulus amplitude. The stimulus current delivered to each fiber is a function of the distance between the stimulating electrode and excitation site. In the model, behavioral threshold is reached when a fixed number of discharges are elicited from converging fibers over a time interval of 100 ms. Model simulations indicate that stochastic behavior in peripheral auditory nerve processes strongly affects behavioral thresholds. The relative level of neural membrane noise was estimated by comparing model predictions with measurements of behavioral threshold as a function of the number of stimulus pulses. Estimated membrane noise levels are similar to those observed in unit recordings in electrically stimulated cochleas. Estimated membrane noise levels are relatively high, as might be expected with stimulation of small‐diameter dendrites. Estimated levels of stochastic activity may be related to the status of dendrites in the cochlea.
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