The effects of rise-time and frequency on the auditory brainstem response using high-frequency tone-bursts Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/h702qb46k

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  • The effects of rise-time and frequency on the auditory brainstem response were studied in six normal hearing adults. Stimuli were high-frequency gated tone-bursts with center frequencies of 8, 10, 12, and 14 kilohertz (kHz). Examined rise-times were .1, .25, .5, and 1.0 milliseconds (msec). Duration was maintained at 2 msec. Presentation levels were set at 60 decibels sensation level (dB SL) for each rise-time/frequency combination. Mean absolute and inter-wave latencies for Jewett peaks I, III, and V were compared with one another as a function of treatment. The results agree with reported literature in that rise-time significantly affects latency. As rise-time is increased, absolute latencies increase. Frequency is not found to significantly affect latency. Possible underlying mechanisms responsible for this particular finding are discussed. In addition, based on initial comparisons with the .2 msec norm for test-retest repeatability, it is discovered that slower rise-times may have a deleterious affect on latency repeatability. Further analysis and investigative needs directly related to the present study are discussed, as well as those related to rise-time in general. It is suggested that rise-time studies should encorporate or lead to further investigations concerning the effects of rise-time on the repeatability of the evoked response. This information is needed prior to selecting or recommending an appropriate stimulus rise-time for use in frequency-specific ABR test protocols.
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