Realistic Basilar Membrane Tuning Does Not Require Active Processes
This paper describes two versions of a cochlear model (called the OHCAP model), both of which exhibit mechanical response tuning very similar to that recently measured in the real cochlea. Two assumptions made in the formulation of the model, that make it different from previous cochlear models, are that the basilar membrane has two radial modes of vibration (corresponding to division into its arcuate and pectinate zones), and that the outer hair cells (OHCs) greatly modify the mechanics of the arcuate zone. The two versions of the OHCAP model presented here have different models for the OHCs. Both versions exhibit very realistic tuning, and so it remains to be determined which is more acceptable in terms of physiological justifiability. However, both versions of the OHCAP model are passive, which shows that active processes are not necessary to explain the cochlea’s sharp tuning.
KeywordsOuter Hair Cell Stimulus Frequency Basilar Membrane Phase Jump Cochlear Model
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