- Graeme Clark Collection
Graeme Clark Collection
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ItemPerception of sentences, words, and speech features by profoundly hearing-impaired children using a multichannel electrotactile speech processorCowan, Robert S. C. ; Blamey, Peter J. ; Galvin, Karyn L. ; Sarant, Julia Z. ; Alcantara, Joseph I. ; Clark, Graeme M. ( 1990)Abstract not available due to copyright.
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ItemSpeech feature recognition by profoundly hearing impaired children using a multiple-channel electrotactile speech processor and aided residual hearingAlcantara, Joseph I. ; Whitford, Lesley A. ; Blamey, Peter J. ; Cowan, Robert S. C. ; Clark, Graeme M. ( 1990)Abstract not available due to copyright.
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ItemSpeech feature recognition with an electrotactile speech processorCowan, R. S. C. ; Blamey, P. J. ; Alcantara, J. I. ; Clark, Graeme M. ; Whitford, L. A. ( 1989)The performance of eight subjects was assessed on a closed-set tactual test battery to evaluate efficiency of the speech feature encoding strategy currently used in the University of Melbourne multichannel electrotactile speech processor. The test battery included twelve subtests of suprasegmental and segmental speech feature contrasts. Results showed that all subjects scored significantly above chance on suprasegmental features such as syllable number, stress and vowel length. In addition, seven of the eight subjects scored significantly above chance for vowel formant frequency discrimination. Scores for manner of articulation contrasts were more variable, with better performance for the higher frequency, longer duration fricatives and affricates. Scores for voicing contrasts suggested that improvements to the tactual coding of this feature could be achieved. The second study examined the contribution of the tactual input to consonant feature identification for subjects using the electrotactile aid in combination with either a low-pass filtered auditory input or different levels of aided residual hearing and lipreading. Results for four normally-hearing subjects showed increased voicing and manner identification scores with the addition of tactual input. Similar results were found for two hearing-impaired subjects, one using the tactual input in combination with lipreading and one using the tactual input in combination with aided residual hearing.
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ItemSpeech perception studies using a multichannel electrotactile speech processor, residual hearing, and lipreadingCowan, Robert S. C. ; Alcantara, Joseph I. ; Whitford, Lesley A. ; Blamey, Peter J. ; Clark, Graeme M. ( 1989)Abstract not available due to copyright.
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ItemSpeech perception using combinations of auditory, visual, and tactile informationBlamey, Peter J. ; Cowan, Robert S. C. ; Alcantara, Joseph I. ; Whitford, Lesley A. ; Clark, Graeme M. ( 1989)Four normally-hearing subjects were trained and tested with all combinations of a highly-degraded auditory input, a visual input via lipreading, and a tactile input using a multichannel electrotactile speech processor. The speech perception of the subjects was assessed with closed sets of vowels, consonants, and multisyllabic words; with open sets of words and sentences, and with speech tracking. When the visual input was added to any combination of other inputs, a significant improvement occurred for every test. Similarly, the auditory input produced a significant improvement for all tests except closed-set vowel recognition. The tactile input produced scores that were significantly greater than chance in isolation, but combined less effectively with the other modalities. The addition of the tactile input did produce significant improvements for vowel recognition in the auditory-tactile condition, for consonant recognition in the auditory-tactile and visual-tactile conditions, and in open-set word recognition in the visual-tactile condition. Information transmission analysis of the features of vowels and consonants indicated that the information from auditory and visual inputs were integrated much more effectively than information from the tactile input. The less effective combination might be due to lack of training with the tactile input, or to more fundamental limitations in the processing of multimodal stimuli.
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ItemResults for two children using a multiple-electrode intracochlear implantBusby, P. A. ; Tong, Yit C. ; Roberts, S. A. ; Altidis, P. M. ; Dettman, S. J. ; Blamey, Peter J. ; Clark, Graeme M. ; Watson, R. K. ; Rickards, Field W. ( 1989)Abstract not available due to copyright.