Rose, Darrell E.||Shearer, William M.
M.A. (Master of Arts)
Department of Speech
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.
Clayton, Lawrence G., "Acoustically evoked responses as a function of recruitment phenomena" (1968). Graduate Research Theses & Dissertations. 971.
viii, 57 pages
Northern Illinois University
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