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Acoustic distortion products in rabbit ear canal. I. Basic features and physiological vulnerability
B L Lonsbury-Martin1, G K Martin, R Probst
1Dept. of Otorhinolaryngology and Communicative Sciences, Baylor College of Medicine, Houston, TX 77030.
Hearing Research
|January 1, 1987
Summary
Acoustic distortion products (DPs) in rabbits reveal how specific ear regions function. Manipulating sound and cochlear conditions showed DPs reflect primary tone activity, aiding in understanding hearing mechanisms.
Area of Science:
- Auditory Neuroscience
- Otoacoustic Emissions Research
- Mammalian Hearing Physiology
Background:
- Acoustic distortion products (DPs) are specific to primary tones (f1, f2), offering potential for detailed frequency-place mapping in the cochlea.
- It remains unclear if DPs solely represent activity at primary tone sites or if remote cochlear regions contribute to the measured signal.
Purpose of the Study:
- Investigate general features of acoustic-DP generation in rabbits to enable future experiments identifying specific basilar-membrane contributions.
- Systematically manipulate stimulus conditions and cochlear physiological states to understand DP generation.
Main Methods:
- Systematic manipulation of stimulus levels and frequencies for primary tones (f1, f2).
- Alteration of cochlear physiological state via exposure to fatiguing sound and anoxia.
- Observation of odd-order intermodulation DPs (e.g., 2f1-f2, 3f1-2f2, 2f2-f1).
Main Results:
- DP magnitude generally correlated with primary tone levels and frequencies, consistent with prior mammalian studies.
- Basic attributes of acoustic DPs were affected by primary tone parameters and cochlear metabolic state (anoxia).
- General anesthesia did not significantly impact DP amplitude.
Conclusions:
- Acoustic DP generation in rabbits shares fundamental characteristics with other mammals.
- Findings support further investigation into specific basilar-membrane contributions to DP generation using advanced techniques.