Graeme Clark Collection

Permanent URI for this collection

http://hdl.handle.net/11343/375

Filters

1982 - 1983 2
Reset filters

Settings
Statistics
Citations
Author: Clark, Graeme × Author: Dowell, Richard × End date: 1989 × Start date: 1980 × Type: Conference Item × Subject: cochlear implant × Subject: otolaryngology ×

Search Results

Now showing 1 - 2 of 2
  • Item
    Thumbnail Image
    Psychophysical matching of sensations produced by acoustic and electrical stimulation of the auditory nerve [Abstract]
    Blamey, P. J. ; Dowell, R. C. ; Tong, Y.C. ; Clark, Graeme M. (Monash University Press, 1983)
    The aim of this study was to establish an acoustic model of a multiple-channel cochlear implant that could be used in the development of speech coding strategies. Identical psychophysical tests were carried out with electrical stimuli for two cochlear implant patients and with acoustic stimuli for three normally hearing listeners. Each electrical stimulus was a train of biphasic pulses at a constant rate between 50 and 100 pps directed to one of the 10 electrodes spaced at 1.5mm intervals around the basal turn of the cochlea (Clark et al. 1977). The corresponding acoustic stimulus was a train of noise bursts at a rate equal to the electrical pulse rate. The noise bursts were passed through one of 8 bandpass filters with centre frequencies equally spaced on a logarithmic scale from 1140 to 10880 Hz representing 8 different electrodes.
  • Item
    Thumbnail Image
    Single versus multiple-channel electrical stimulation of the auditory nerve in speech processing for a totally deaf patient [Abstract]
    Clark, Graeme M. ; Tong, Y. C. ; Dowell, R. C. ( 1982)
    Auditory neurophysiological studies have provided evidence that frequency is coded on both a place and time basis. Psychophysical studies on patients with a profound or total postlingual hearing loss have established that electrical stimulation of the auditory nerve can also convey pitch sensations that depend on toe place or site of auditory nerve stimulation. Pitch perception is also related to the rate of stimulation (Tong et al., 1980). The present study has been undertaken to determine whether a totally deaf patient can integrate both the place and time information from frequency coding in understanding speech signals. Audiological tests were performed to evaluate a totally deaf patient's perception of phonemes, words and sentences for single-channel stimulation that conveyed the fundamental frequency (FO) as rate of stimulation; and multiple-channel stimulation that presented the fundamental frequency as rate, and the second formant (F2) as place of stimulation. The results shown in the table indicate that multiplechannel stimulation provided significantly better scores than single-channel stimulation when using electrical stimulation alone. Furthermore, all scores were significantly better for multiple channel stimulation when combined with lip reading, except the MRT word test. 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.