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Nonlinear temporal interactions in click-evoked otoacoustic emissions. II. Experimental data
1Institute of Sound and Vibration Research, University of Southampton, SO17 1BJ, Southampton, UK. sk@isvr.soton.ac.uk
Hearing Research
|July 29, 2000
Summary
Suppressor clicks alter click-evoked otoacoustic emissions (CEOAEs) amplitude. Nonlinear temporal interactions in CEOAEs may stem from generator element disturbance, not just I-O function non-linearity, suggesting CEOAEs can probe cochlear mechanics.
Area of Science:
- Auditory Neuroscience
- Otoacoustic Emissions Research
- Cochlear Mechanics
Background:
- Click-evoked otoacoustic emissions (CEOAEs) show amplitude changes with preceding or succeeding suppressor clicks.
- A previous model suggested these nonlinear temporal interactions arise from the CEOAE input-output (I-O) function's compressive non-linearity.
Purpose of the Study:
- To investigate nonlinear temporal interactions in CEOAEs through a parametric study.
- To compare experimental findings with a theoretical model based on CEOAE I-O function non-linearity.
Main Methods:
- Studied 12 normal adult ears.
- Varied test and suppressor click levels and inter-click intervals.
- Measured CEOAE amplitude changes under different suppressor conditions.
Main Results:
- Maximum suppression often occurred with advance suppressors, contrary to the model.
- The degree of advance depended systematically on click levels.
- Measured suppression levels sometimes exceeded the model's theoretical maximum.
Conclusions:
- Nonlinear temporal interactions in CEOAEs likely involve more than just I-O function non-linearity.
- Disturbance of cochlear generator elements from their resting state may explain the observed effects.
- CEOAEs show potential for investigating cochlear mechanics and responses to transient stimuli.