Publication Date

1968

Document Type

Dissertation/Thesis

First Advisor

Rose, Darrell E.||Shearer, William M.

Degree Name

M.A. (Master of Arts)

Legacy Department

Department of Speech

LCSH

Audiometry

Abstract

Auditory evoked responses were obtained from eight persons possessing unilateral hearing involvement presumed to be of cochlear origin in which recruitment was present. Wave form properities of the evoked response for normal and pathological ears were observed. Specifically, the normal ear was stimulated and evoked auditory responses obtained at 20dB SL, 40dB SL and equivalent dB of intensity (85-95dB) while the pathological ear was observed at a 20 balance, a 40 balance and equivalent dB of intensity (85-95dB). The experimental frequency was determined through the screening process (either 1000, 2000 or 4000Hz). Results indicated no statistical difference in the latency of the AER as a function of stimulation level between the two groups. Latency, as a function of intensity did reveal a significant difference for each group at all components, i.e., (N₁), (P₁) and (N₂). Amplitude measures for components (N₁-P₁) and (P₁-N₂) at 40dB SL exhibited a numerical difference when compared to the 20dB SL. However, a statistical difference was not established. No significant difference was observed between groups for mean peak to peak amplitude amplitude characteristics as a function of stimulus level for components (N₁-P₁) and (P₁-N₂). Finally, this study may indicate that the phenomena of recruitment compresses the range of amplitude for the components (pathological ear) of the evoked response measured In this investigation.

Comments

Includes bibliographical references.||Includes illustrations.||Pages vii-viii are between pages ii and iii.

Extent

viii, 57 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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