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RETROGRADE WAVES IN THE COCHLEA

Retrograde waves in the cochlea are important because they provide information about cochlear mechanics that may be measured in the external ear canal as otoacoustic emissions. By extending traditional wave-variable methods, an explicit equation is derived for the forward-traveling wave in a one-dimensional cochlear model that is equivalent to the WKB approximation. The corresponding equation for the retrograde waves requires no additional approximation and provides a simple characterization of cochlear reflectance.