Abstract
Responses of neurons in the primary auditory cortex were compared in gerbils receiving intracochlear electric or acoustic stimulation. Stimuli were trains of periodic electric pulses or of acoustic clicks. Interspersed between intervals of equal length were single intervals which were longer, by some Δt. The Δt and the repetition rate of these prolonged intervals were varied. The degree of synchronization of spikes to the regular occurrences of prolonged intervals was quantified. While thresholds for synchronized responses to Δt (at Δt repetition rates of 4–6 Hz) were about a hundredfold higher for electric (about 5–10 ms) than for acoustic stimulation (about 30 s), Δt repetition rate response functions were similar for both types of stimulation. The results suggest the feasibility of coding brief acoustic transients by prolonged intervals in electric pulse trains with high pulse repetition rates, which could be another useful strategy for cochlear implants.
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