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Updated: Jul 2, 2026
08:51
Data Acquisition and Analysis In Brainstem Evoked Response Audiometry In Mice
Published on: May 10, 2019
Auditory brainstem response at the detection limit
Bernd Lütkenhöner1, Annemarie Seither-Preisler
1Section of Experimental Audiology, ENT Clinic, Münster University Hospital, Kardinal-von-Galen-Ring 10, 48129 Münster, Germany. Lutkenh@uni-muenster.de
Journal of the Association for Research in Otolaryngology : JARO
|August 16, 2008
Summary
Auditory brainstem responses (ABR) near the detection limit transition from proportional to logarithmic growth with increasing sound intensity. This suggests no true sensory threshold exists, but a quasithreshold can be defined.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Signal Processing
Background:
- Previous modeling predicted specific level-dependent growth patterns for auditory evoked responses near detection thresholds.
- Understanding auditory evoked responses at low sound levels is crucial for auditory perception research.
Purpose of the Study:
- To experimentally validate predictions of auditory evoked response level dependence near the hearing threshold.
- To investigate the growth function of auditory brainstem responses (ABR) at near-threshold sound levels.
Main Methods:
- Auditory brainstem responses (ABR) were recorded using Gaussian-shaped 4-kHz tone pulses presented near the subjective detection threshold.
- Over one million stimulus repetitions were averaged to enhance signal-to-noise ratio for near-threshold responses.
- The amplitude of ABR wave V was analyzed in relation to sound intensity and sound pressure.
Main Results:
- ABR wave V amplitude exhibited a smooth transition from proportional to logarithmic growth as sound intensity increased.
- Logarithmic growth of ABR amplitude corresponds to a linear increase with sound level in decibels.
- Near the detection limit, ABR amplitude can be approximated as a linear function of sound pressure.
Conclusions:
- Experimental data align with models suggesting the absence of a strict sensory threshold in audition, consistent with signal detection theory.
- A 'quasithreshold' can be operationally defined using the observed growth functions, correlating with subjective detection thresholds.
- The findings contribute to a refined understanding of auditory processing at the periphery and its representation in the brainstem.
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