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|Title:||Frequency-Discrimination Performance of Normal-Hearing and Hearing-Impaired Listeners|
|Author(s):||Matthies, Melanie Lynne|
|Department / Program:||Speech and Hearing Science|
|Discipline:||Speech and Hearing Science|
|Degree Granting Institution:||University of Illinois at Urbana-Champaign|
|Subject(s):||Health Sciences, Audiology|
|Abstract:||Frequency-discrimination data were obtained for 12 normal-hearing and six hearing-impaired subjects with a 3-interval, 2-cued, yes/no task for a variety of signals. These signals included pure tones, fixed-bandwidth (400 Hz) narrow-band noise and ratio-bandwidth (20%) narrow-band noise. Analyses included response factors in frequency discrimination, comparison of the data from the normal-hearing subjects with published data, relation of the pure-tone and narrow-band noise tasks and performance of the hearing-impaired subjects.
Response factors included criterion as measured by the Beta statistic, sequential effects as described by auto-correlation calculations and learning effects as summarized by the number of practice blocks to stable and asymptotic performance. A wide range of frequency-discrimination results was demonstrated by the normal-hearing subjects and this range appeared to be unrelated to response factor or to threshold as measured by an adaptive 21FC procedure. The results from the hearing-impaired subjects overlapped those of the normal-hearing subjects in a number of cases and the response factors (learning, sequential effects and response criterion) were found to be very similar for both subject groups. With the hearing-impaired subjects, the relation between magnitude of hearing loss and difference limen was strongest for the 5000-Hz signals and weakest for the 500-Hz signals.
A prediction equation was derived from multiple-regression analysis which accounted for approximately 91% of the variance in frequency-discrimination performance across the 18 subjects with three factors (frequency, sensation level, and signal bandwidth) and a constant. Hearing loss affected the comparisons between pure-tone and narrow-band noise difference limina by making the differences between these smaller than would be expected from the data of the normal-hearing subjects.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984.
|Date Available in IDEALS:||2014-12-16|
This item appears in the following Collection(s)
Dissertations and Theses - Speech and Hearing Science
Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois