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Human offset auditory brainstem response: effects of stimulus acoustic ringing and rise-fall time
L E Van Campen1, J W Hall, D W Grantham
1Division of Hearing and Speech Sciences, Vanderbilt University School of Medicine, Nashville, TN 37212-3102, USA.
Hearing Research
|January 1, 1997
Summary
Offset auditory brainstem response (ABR) is a genuine auditory evoked potential, not an artifact of acoustic ringing. This study confirms offset ABR validity across various stimulus conditions in normal-hearing adults.
Area of Science:
- Auditory Neuroscience
- Neurophysiology
- Audiology
Background:
- Offset auditory brainstem response (ABR) has been debated as an artifact caused by stimulus acoustic ringing.
- Its sensitivity to stimulus rise-fall times has been linked to acoustic ringing effects.
Purpose of the Study:
- To investigate the validity of offset ABR.
- To determine if offset ABR is a genuine response or an artifact of acoustic ringing.
Main Methods:
- Recorded offset ABR in 40 young, normal-hearing adults.
- Utilized computer-generated 10-ms tone bursts (500 and 2000 Hz) with varied acoustic ringing and rise-fall times.
- Conducted experiments manipulating acoustic ringing, rise-fall times, and rise times in stimuli with no ringing.
Main Results:
- Reliable offset ABRs were obtained across all tested degrees of acoustic ringing, including stimuli with no ringing.
- Offset ABR demonstrated sensitivity to stimulus rise and fall times.
- The 500-Hz stimulus elicited the most robust offset ABR.
Conclusions:
- Offset ABR is a real physiological response.
- The findings refute the hypothesis that offset ABR is solely an artifact of acoustic ringing.