No description available.

No description available.

The purpose of this study was to investigate the relationship between live and recorded determinations of most comfortable loudness levels (MCL's) and to determine if a relationship existed between MCL's, tolerance levels (TL's), and acoustic reflex thresholds so that further research might be conducted regarding the use of acoustic impedance measures in hearing aid fitting.Thirty normal hearing female subjects were tested in this investigation. MCL's using live and recorded stimuli, TL's, and contralateral and ipsilateral acoustic reflex thresholds were obtained for each subject. Correlation coefficients were computed to determine if a relationship existed between any of the measurements.It was concluded that live voice stimuli yielded highly equivalent results to recorded stimuli in finding MCL's. Acoustic reflex thresholds were found to be poor predictors of MCL's and TL's. Before acoustic reflex measurements can be used in hearing aid fitting procedures, further research is warranted.

The purpose of this investigation was to determine whether five different brands of directional hearing aids would perform with the same efficiency. Using fifteen normal hearing subjects, the efficiency of the directionality of the aids was first evaluated by obtaining pure tone and. speech reception thresholds from both in front and behind each listener. To evaluate the hearing aids' effects on subjects' word discrimination ability, discrimination scores were obtained both in quiet and noise. Finally, each subject expressed his feelings regarding the performance of each aid using a rating scale.The results indicated there was a significant difference in the overall attenuation abilities of the aids, and the aids significantly attenuated some threshold conditions pore efficiently than others. The overall discrimination scores for the aids did not differ significantly, but all five aids provided a significantly higher score in quiet as compared to noise. The results of the subjective ratings indicated no significant differences among the five aids.

Thesis (M.S.)--Rochester Institute of Technology, 1992. / Typescript. Includes bibliographical references (leaves 54-55).

Thesis (M. Phil.)--University of Hong Kong, 2008. / Includes bibliographical references (p. 116-134) Also available in print.

Thesis (B.Sc)--University of Hong Kong, 2005. / "A dissertation submitted in partial fulfilment of the requirements for the Bachelor of Science (Speech and Hearing Sciences), The University of Hong Kong, June 30, 2005." Also available in print.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1949. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves [180]-185).

Thesis (M.S.)--University of Wisconsin--Madison, 1972. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M. Sc.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves 46-51).