Graeme Clark Collection

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Author: Clark, Graeme × Author: MARTIN, LOIS × Type: Journal Article × Subject: post-lingually deaf patients ×

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    A multiple-channel cochlear implant: an evaluation using an open-set word test
    Clark, Graeme M. ; Tong, Y. C. ; Martin, L. F. ; Busby, P. A. ( 1981)
    Multiple-channel electrical stimulation of the hearing nerve in conjunction with speech reading has helped two post-lingually deaf patients with total hearing losses understand running speech in every day situations. This has been confirmed using open-set phonetically balanced word tests, where the patients achieved 60% and 40% scores with isolated-words and 80% and 73% for phonemes-in-isolated words. The tests also showed that the cochlear implant improved word recognition by a factor of four in one patient and two in another compared with speechreading alone. The speech processor used extracted the voicing frequency and energy and the frequency and energy of the dominant spectral peak in the mid-frequency range. The parameters for voicing determined the rate of stimulation for all electrodes, and the parameters for the dominant spectral peak in the midfrequency range determined the site of electrode stimulation and current level.
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    A multiple-channel cochlear implant. An evaluation using closed-set spondaic words
    Clark, Graeme M. ; Tong, Y. C. ; Martin, L. F. (Cambridge University Press, 1981)
    Two post-lingually deaf patients with total hearing losses have had help in communicating, using a multiple-channel cochlear implant(Tong et al., in press; Tong and Clark, 1980). Single-channel implants have also been shown to be of value (House et al., 1976; Fourcin et al., 1979). As the multiple-channel device, however, requires an intra-cochlear electrode array it was considered worthwhile comparing the closed-set spondaic word test results obtained from our patients with those from intra-cochlear single-channel implants (Bilger et al., 1977). Using the multiple-channel device speech was processed by extracting the voicing frequency and energy, and the frequency and energy of the dominant spectral peak in the mid-frequency range. The parameters for voicing determined the rate of stimulation for all electrodes, and the parameters for the dominant spectral peak in the mid-frequency range determined the site of electrode stimulation and current level. On the other hand, with the single-channel implant (House et al., 1976) the speech wave amplitude modulated a 16 kHz carrier frequency, and this in tum stimulated the auditory nerve.