Graeme Clark Collection

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1984 - 1987 2
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Author: Dowell, Richard × Author: Seligman, Peter × Start date: 1980 × Type: Journal Article × Subject: cochlear prosthesis ×

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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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    Clinical trial of a multi-channel cochlear prosthesis: results on 10 postlingually deaf patients
    Clark, Graeme M. ; Dowell, R. C. ; Pyman, B. C. ; Brown, A. M. ; Webb, R. L. ; Tong, Y. C. ; Bailey, Q. ; Seligman, P. M. ( 1984)
    The clinical trial of a multi-channel cochlear prosthesis has been carried out on 10 profoundly-totally deaf adult patients. Speech perception tests have shown that all the patients received significant benefit from the device. They obtained improvements in understanding running speech from 47% to 550% when using the device in conjunction with lipreading compared to lipreading alone. With an open-set CID sentence test, three patients obtained scores showing an ability to understand speech without the need to lipread, and a further three patients had scores indicating they could also receive useful information without lipreading. In two patients, very limited open-set scores for electrical stimulation alone were obtained. This was most probably due to the fact that only a few channels of stimulation were possible due to cochlear disease and they were therefore receiving information more like a single-channel device. The prosthesis has also been found to provide considerable help in hearing and recognizing everyday sounds.