Graeme Clark Collection

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End date: 1989 × Start date: 1983 × Type: Conference Item × Subject: auditory nerve fibre responses × Subject: otolaryngology ×

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    Ventral cochlear nucleus and auditory nerve fibre responses to electrical stimulation of the cat cochlea [Abstract]
    Maffi, C. L. ; Tong, Y. C. ; Shepherd, R. K. ; Clark, Graeme M. ; Webb, R. L. ( 1987)
    Discharge patterns of cat auditory nerve fibres and ventral cochlear nucleus neurones to constant-current biphasic pulses have been recorded. The study was carried out to determine the input-output characteristics of the neurones, for variations in the rate and intensity of electrical stimulation. Neural discharges were highly synchronized with the current pulses at suprathreshold stimulus intensities, and saturation discharge rates usually equalled stimulus pulse rates up to 800 pulses/s. The electrically-driven discharge patterns of ventral cochlear nucleus neurones exhibiting "primary-like" responses were similar to those recorded from electrically-stimulated auditory nerve fibres. Comparison of the neural responses to electrical and acoustic stimulation may help in the design of improved speech processors for cochlear implants. Field potential responses were depressed at high stimulus rates and charge densities, suggesting stimulus-induced reduction in neural excitability. The effects of stimulus parameter variations on field potentials may help in determining safety limits of the electrical stimulus.