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Thesis (M.S.)—University of Nebraska—Lincoln, 1999. Speech-Language Pathology and Audiology.


Copyright 1999, the author. Used by permission.


The purpose of the following study is to study experimentally the differences in the amount hearing decreases after listening to loud noise. In the past, researchers have suggested that men and women as well as left and right ears experience differing amounts of temporary hear loss, called temporary threshold shift (TTS). Careful selection of twenty subjects was made to ensure all were normal hearing with healthy ears. Each subject’s hearing was tested at all frequencies and recorded. Subjects randomly drew instructions assigning them to either a left or right ear group. All subjects listened to a broad-band static-like loud noise through headphones for a total of four hours. After each hour, hearing was rechecked at one frequency in the ear that was originally assigned to each individual. The change in hearing, or TTS, was found by subtracting the hearing level before listening from the hearing level after four hours of listening. The data were analyze to assess the statistical significance of the change in hearing between men and women, and right and left ears, and the time of testing. The results did not indicate significant changes between gender and ear. The factor of time of listening was found to be significant.

Advisor: T. Newell Decker