OHC inhibition and excitation OHCs model OHC models
OHC inhibition and excitation
OHC’s model
(OHC model’s equation (1 }
OHC Properties
Linear Approximation
(OHC model’s equation (2 When:
The embedded model
Frequency Domain Model
Parameters Estimation For and
Model’s Simulation Relative • basilar membrane velocity
Cochlear representations of Chirp Cochlear representation
Cochlear representations of “SHEN” Cochlear representation
Model’s Simulation
Impaired Hearing
Simulated Audiograms Normal OHC activity Partial damaged OHC No OHC activity
Non Linear Properties 3/4/2021 10: 41 AM
Non Linearity
Postmortem Effect
Non Linear Properties
Non linearity and Cubic Combination Tones Compression – Output ‘Cochlear amplifier’ – many non-linear • effects Combination Tones – Input 2 f 1 -f 2 f 1 f 2 Frequency
Combination Tones- Psychophysics
Combination Tones – Basilar Membrane
CT with non linear functions All non linear functions types in all model • components can cause CT Time Frequency Input = 2 k. Hz + 2. 44 k. Hz; Equal level
Otoacoustic Emissions
The Human Ear Model Outer ear Middle ear TM Incudostapedial joint Oval window microphone Piston based model •
Middle ear model equations
Cochlear response to a click 100 us Stapes Stimulus Apex
Introducing cochlear “roughness”
Model Representation – click
Emission Spectrum
Simulated Audiograms Normal OHC activity with “roughness” Partial OHC activity with “roughness”
Damaged cochlear response
- Slides: 35
