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Modeling temporal and compressive properties of the normal and impaired auditory system
R P Derleth1, T Dau, B Kollmeier
1Graduiertenkolleg Psychoakustik, Medizinische Physik, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Germany.
Hearing Research
|August 25, 2001
Summary
This study models sensorineural hearing loss by modifying an auditory processing model. Model 1, incorporating an instantaneous expansion, best simulates impaired hearing, including altered loudness and dynamic range.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Signal Processing
Background:
- Sensorineural hearing loss involves altered loudness perception and reduced dynamic range.
- Existing auditory processing models require modification to accurately simulate these impairments.
Purpose of the Study:
- To present and test three modified auditory processing models simulating sensorineural hearing loss.
- To incorporate level-dependent peripheral compression affected by hearing impairment.
Main Methods:
- Introduced three model modifications: Model 1 (instantaneous expansion), Model 2 (fast compression), Model 3 (slow compression).
- Tested models against recruitment and forward-masking data for normal and impaired hearing.
- Evaluated temporal processing of fluctuating stimuli.
Main Results:
- All models simulated recruitment and forward-masking similarly.
- Model 1 predicted a modulation-rate-independent increase in modulation-response level for impaired hearing.
- Models 2 and 3 showed modulation-rate-dependent increases, conflicting with literature.
Conclusions:
- Key aspects of sensorineural hearing loss can be modeled by incorporating a fast-acting expansion before nonlinear adaptation.
- A proposed model for normal and impaired hearing includes cochlear nonlinearity, instantaneous expansion, and retro-cochlear processing.