Percepts produced by electrical stimulation of the human cochlea [Abstract]
AuthorTong, Y. C.; Clark, Graeme M.
Source TitleProceedings of the Australian Physiological and Pharmacological Society
University of Melbourne Author/sClark, Graeme
Document TypeConference Item
CitationsTong, Y. C., & Clark, G. M. (1982). Percepts produced by electrical stimulation of the human cochlea [Abstract]. In Proceedings of the Australian Physiological and Pharmacological Society.
Access StatusOpen Access
This is an abstract of a paper from the Proceedings of the Australian Physiological and Pharmacological Society published by Australian Physiological and Pharmacological Society. This version is reproduced with the permission of the publisher.
Electrical stimulation of the residual auditory nerve fibres in a postlingually deaf patient was effected by ten electrodes implanted 1.5 mm apart in the scala tympani. Biphasic current pulses with each phase fixed at 180 µs were used. Psychophysical results obtained by activating one electrode at a time showed the following characteristics: (a) loudness was found to increase with both current level and repetition rate; (b) pitch increased with repetition rate; (c) pitch and sharpness increased in the apical to basal direction in accordance with the tonotopic organisation of the cochlea; (d) dissimilarity measures obtained by triadic comparisons provided evidence that the sensations produced by repetition rate and electrode position are perceptually separable; (e) for short-duration stimuli the discrimination performance for electrode trajectories was much better than for repetition rate trajectories. For simultaneous activation of two electrodes, triadic comparisons showed that two perceptual components, one related to the more basal electrode and the other to the more apical one, could be discerned.
Keywordsotolaryngology; electrical stimulation; cochlear implant
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- Graeme Clark Collection