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High-frequency tone burst-evoked ABR latency-intensity functions
S A Fausti1, D J Olson, R H Frey
1Auditory Research Laboratory, Department of Veterans Affairs Medical Center, Portland, Oregon 97207.
Scandinavian Audiology
|January 1, 1993
Summary
High-frequency auditory brainstem responses (ABRs) reliably track hearing changes. Latency-intensity functions (LIFs) in normal hearing individuals show significant latency shifts with intensity changes, providing a baseline for hearing loss assessment.
Area of Science:
- Audiology
- Neuroscience
- Hearing Science
Background:
- Auditory brainstem responses (ABRs) are crucial for assessing auditory pathway function.
- High-frequency tone burst stimuli offer a refined method for ABR evaluation.
- Understanding latency-intensity functions (LIFs) is key to interpreting ABR results.
Purpose of the Study:
- To determine the latency-intensity functions (LIFs) for high-frequency tone burst-evoked ABRs in normal-hearing individuals.
- To establish normative data for high-frequency ABR latency shifts.
- To assess the reliability and validity of high-frequency tone bursts for ABR testing.
Main Methods:
- Utilized high-frequency tone burst stimuli (8, 10, 12, 14 kHz).
- Recorded auditory brainstem responses (ABRs) in 14 normal-hearing participants.
- Analyzed latency-intensity functions (LIFs) across varying stimulus intensities.
Main Results:
- Significant shifts in response latency (waves I and V) were observed with increasing stimulus intensity for all tested frequencies.
- Latency shifts were statistically significant for each 10 dB intensity change, with minimal exceptions.
- The slopes of the LIFs were consistent across frequencies, ranging from 0.020 to 0.030 msec/dB.
Conclusions:
- Established normal latency-intensity functions for high-frequency tone burst-evoked ABRs.
- These findings provide a normative baseline for detecting latency changes associated with hearing loss.
- High-frequency ABRs offer a valuable tool for monitoring auditory function, potentially in cases of progressive hearing loss.