Rose, Darrell E.
M.A. (Master of Arts)
Department of Speech
This study examined the peak latency and amplitude of the acoustically evoked response to pure tone stimuli presented at 20 and 40 dB sensation level (SL). The investigation also compared the threshold levels as determined by evoked response and routine voluntary techniques. The subjects were twelve males with no history of ear pathology or Central Nervous System disorders. A pure tone stimulus (1000 Hz) was presented once every 3.2 seconds. The evoked responses at 20 and 40 dB SL (re: voluntary threshold) were averaged over 64 presentations. The results indicated that there was a close agreement between the threshold levels for the evoked response and voluntary techniques. The comparison of the peak amplitude and latency characteristics between the two sensation levels showed no significant (P<.05) differences except in the latency shift of Component Three (P2). The mean values for all measures did indicate the excepted results for intensity increases but these differences were not significant for any component except Component Three (P2).
Janicek, Wynnette E., "Acoustically evoked responses to pure tones at low sensation levels" (1968). Graduate Research Theses & Dissertations. 973.
Northern Illinois University
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