Date of Award

Spring 2012

Document Type

Dissertation

Degree Name

Doctor of Audiology (AuD)

Department

School of Communication

First Advisor

Sheryl Shoemaker

Abstract

The goal of the present study was to develop an objective technique to measure interhemispheric transfer time (IHTT) of linguistic stimuli using late auditory evoked potentials to develop normative data in adults. Nine participants, five females and four males (M = 25.22) were included in this study. Each participant had their hearing tested and electrodes were placed on the forehead, tip of the nose, below the right eye and several places on the scalp. The results revealed that when comparing electrode sites (CZ, C3, and C4), waves (P1-N1-P2) and ears (right ear and left ear) there was no statistically significant effect for electrode sites and ears; however, there were for waves. There also were no significant interactions when comparing electrodes to waves, waves to ears, or electrodes to waves to ears. There was also comparison to determine which waves were significantly different from the others. Analysis did not indicate any statistically significant differences between waves P1-N1-P2 when compared for the right versus the left sides. Overall results revealed consistently shorter latencies when the left ear was stimulated compared to when the right ear was stimulated. These results were unexpected and further research is needed with a larger sample size to fully understand how the human auditory system works.

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