Graeme Clark Collection

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1983 - 1986 2
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Author: Blamey, Peter × End date: 1986 × Start date: 1983 × Type: Conference Item × Subject: otolaryngology ×

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    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.
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    Training and assessment of children using a multi-electrode cochlear implant [Abstract]
    Nienhuys, T. G. ; Roberts, S. A. ; Busby, P. A. ; Tong, Y. C. ; Blamey, P. J. ; Clark, Graeme M. ( 1986)
    A training and assessment protocol has been developed for a research study on deaf children using multi-electrode cochlear implants. The areas of assessment and training include speech perception and production, language and communication skills. Material which is appropriate for language-and developmental-age is selected from a large battery of: tests to ensure that the individual abilities of children are addressed. A single-subject, time-series design has been adopted for regular assessment of the child's performance. The participating child receives a minimum of six months' pre-operative training and assessment using high gain hearing aids or a tactile device. Also included are audiological and medical evaluations to determine the child's suitability for inclusion in the study. Approximately two months are allocated for pre-operative, operative and postoperative surgical management as well as fitting and setting the external speech processor. Post-operatively, the same training and assessment procedures continue for a number of years. Extensive psychophysical studies are also undertaken to measure the child's abilities to discriminate simple stimuli which differ in electrical stimulus parameter values.