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Cochlear dead regions (DRs) are defined as a total loss of inner hair cell function across a limited region of the basilar membrane (Moore, et al., 1999b). This does not result in an inability to perceive sound at a given frequency range, rather the sound is perceived via a spread of excitation to adjacent regions in the cochlea where the inner hair cells are still functioning.
The cochlea is a curled tube and acts as the hearing part of the inner ear. It contains an outer and inner chamber, both of which are filled with liquid. Within the inner chamber is the organ of corti, which contains thousands of hair cells, of which each one has minute formations called stereocilia.