Graeme Clark Collection

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Author: Dowell, Richard × End date: 1987 × Start date: 1980 ×

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    The effects of electrode position and stimulus period on the hearing sensations in a multiple-channel cochlear implant patient [Abstract]
    Tong, Y. C. ; Blamey, P. J. ; Dowell, R. C. ; Clark, Graeme M. ( 1981)
    Abstract not available due to copyright.
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    Perceptual dissimilarity and discrimination studies using two-electrode stimulation with a multiple-channel cochlear implant patient [Abstract]
    Dowell, R. C. ; Tong, Y. C. ; Blamey, P. J. ; Clark, Graeme M. ( 1981)
    Abstract not available due to copyright.
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    A multiple-channel cochlear implant: an evaluation using nonsense syllables
    Clark, Graeme M. ; Tong, Yit Chow ; Martin, Lois F. ; Busby, Peter A. ; Dowell, Richard C. ; Seligman, Peter M. ; Patrick, James F. ( 1981)
    A study using nonsense syllables has shown that a multiple-channel cochlear implant with speech processor is effective in providing information about, voicing and manner and to a lesser extent place distinctions. These distinctions supplement lipreading cues. Furthermore, the average percentage improvements in overall identification scores for multiple-channel electrical stimulation and lipreading compared to lipreading alone were 71% for a laboratory-based speech processor and 122 % for a wearable unit.
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    Pitch and loudness studies on a multiple-channel cochlear implant patient [Abstract]
    Blamey, P. J. ; Tong, Y. C. ; Dowell, R. C. ; Clark, Graeme M. ( 1981)
    Abstract not available due to copyright.
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    Speech tracking: verfahrensweise und ergebnisse
    Mecklenburg, D. J. ; Dowell, R. C. ; Clark, Graeme M. (Springer-Verlag, 1987)
    Das Speech Tracking wurde im Jahre 1978 von De Filippo und Scott als Schulungs-und Untersuchungsverfahren fur Einzelpersonen eingefuhrt, die weitgehend oder vollstandig ertaubt waren. Bei diesem Verfahren werden dem Patienten Textpassagen von zwei bis zehn Wortern vorgelesen. Der Zuhorende, in diesem Fall der Cochlear Implant-Trager, versucht die betroffene Passage wortlich zu wiederholen. Versteht der Patient eines der Worter nicht, so wendet der Vorleser Verfahren an, die dem Zuhorenden weitere Informationen uber den Inhalt vermitteln. Nachdem jedes Wort korrekt wiederholt worden ist, wird eine weitere Passage vorgelesen, bis ein Prufungszeitraum von 10 Minuten abgeschlossen ist (Martin et al. 1981, 1985; Chouard et al. 1983; Tong et al. 1980; Mecklenburg et al. 1984; Rosen et al. 1980).
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    Results for Chinese and English in a multichannel cochlear implant patient
    Xu, S. A. ; Dowell, R. C. ; Clark, Graeme M. ( 1987)
    A multichannel cochlear prosthesis was implanted in a Chinese patient who suffered from profound sensory hearing loss. The preoperative Minimal Auditory Capabilities (MAC) battery tests in English, as well as an open set bisyllable word test, an open set sentence test, and speech tracking in Chinese indicated significant improvement of speech perception for both English and Chinese after the operation. Substantial understanding of running speech was possible in both languages without the help of lipreading.
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    Educational assessment and management of children with multichannel cochlear implants
    Nienhuys, T. G. ; Musgrave, G. N. ; Busby, P. A. ; Blamey, P. J. ; Nott, P. ; Tong, Y. C. ; Dowell, R. C. ; Brown, L. F. ; Clark, Graeme M. ( 1987)
    This paper describes the assessment and training program to evaluate speech, language, and communication skills of profoundly deaf children during and after training. Two sensory aids/prostheses are used: hearing aids and the Nucleus multichannel cochlear implant. Using a single-subject time-series experimental design, children's speech, language, and communication skills are assessed. For speech skills, assessment includes formal tests of articulation and intelligibility, syllable stress and process analyses, analyses of suprasegmental features, and voice quality. For general communication abilities, conversational skills with different speakers, story production skills, comprehension and expression of procedural information, discourse skills, and a measure of conversational interaction skills (pragmatics) are analyzed at regular intervals. Regular observations also sample the subjects' mode and frequency of interactions with individuals and groups in the school and home setting. Normative tests and formal analyses of language samples are also used to assess the overall language age of the child, vocabulary size, and kinds of expressive and receptive, syntactic, and semantic ability.
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    Recent developments with the Nucleus 22-electrode cochlear implant: a new two formant speech coding strategy and its performance in background noise
    Franz, Burkhard K-H. G. ; Dowell, Richard C. ; Clark, Graeme M. ; Seligman, Peter M. ; Patrick, James F. ( 1987)
    A clinical evaluation of speech processing strategies for the Nucleus 22-electrode cochlear implant showed improvements in understanding speech using the new F0F1F2 speech coding strategy instead of the F0F2 strategy. Significant improvement in closed-set speech recognition in the presence of background noise was an additional advantage of the new speech processing strategy.
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    Speech perception using a two-formant 22-electrode cochlear prosthesis in quiet and in noise
    Dowell, Richard C. ; Seligman, Peter M. ; Blamey, Peter J. ; Clark, Graeme M. ( 1987)
    A new speech-processing strategy has been developed for the Cochlear Pty. Ltd. 22-electrode cochlear prosthesis which codes an estimate of the first formant frequency in addition to the amplitude. voice pitch and second formant frequencies. Two groups of cochlear implant patients were tested 3 months after implant surgery, one group (n= 13) having used the old (F0F2) processing strategy and the other (n=9) having used the new (F0FIF2) strategy. All patients underwent similar postoperative training programs. Results indicated significantly improved speech recognition for the F0FIF2 group particularly on open set tests with audition alone. Additional testing with a smaller group of patients was carried out with competing noise (speech babble). Results for a closed set spondee test showed that patient performance was significantly degraded at a signal-to-noise ratio of 10 dB when using the F0F2 strategy, but was not significantly affected with the F0FIF2 strategy.
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    Evaluation of a two-formant speech-processing strategy for a multichannel cochlear prosthesis
    Dowell, R. C. ; Seligman, P. M. ; Blamey, P. J. ; Clark, Graeme M. ( 1987)
    Initial results with the two-formant speech-processing strategy (F0FIF2) confirm the advantage of a multichannel cochlear prosthesis capable of stimulating at different sites within the cochlea. The successful presentation of two spectral components by varying the place of stimulation leads to the possibility of presenting further spectral information in this manner. Because virtually all multichannel implant patients demonstrate good "place" (electrode site) discrimination, these more refined coding strategies should lead to benefits for the majority of implantees. Already, with the F0FIF2 strategy, we have a system that appears to provide some effective auditory-alone communication ability for the average patient.