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KMID : 0858620020060010041
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Korean Journal of Audiology
2002 Volume.6 No. 1 p.41 ~ p.44
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Competing Feature Discrimination in Electrical Stimulation
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Lim Duk-Hwan
Kim Chong-Sun
Chang Sun-O
Oh Seung-Ha
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Abstract
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The cochlear implant patients often have difficulty in improving the level of speech intelligibility in electrical stimulation. This speech discrimination is likely to be influenced by spectral compositions among perceptually related acoustic variables. The components in a speech sound can affect each other significantly. We investigated effects of these discriminating interactions between competing stimulus features in cochlear implantees. Stimuli consisted of simultaneous
and sequential combinations of two tones synthesized from vowel and consonant test sets. While selected acoustic features were systematically adjusted, patients were asked to choose answers in a closed set test and correct responses
were scored in the scale of intelligibility. Participants showed various levels of intelligibility in the measured scale. These results had clinical implications that favored speech coding strategies appeared to have some degree of correlation with high-scored feature representation schemes. This method of testing effective range of stimulus parameters was proposed as a quantitative tool of refining the mapping strategies in the cochlear implanting devices. Individualized testing procedures can be incorporated in the rehabilitation programs of cochlear implantees.
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KEYWORD
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Electrical stimulation, Acoustic features, Discrimination, Sequential combination, Simultaneous combination
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