shapnessoftuning - membrane It works to a first...

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I am having trouble understanding question number 11: Frequency-to-place transformation that occurs in the cochlea. .. What is the transformation? What frequencies are mapped where? Since the auditory never fibers are too narrow to follow Von Bekesy's explanation, what additional factor might explain the sharpness of tuning? Is this related to the tuning curves and the different threshold of tuning curve corresponding to the highest frequency of sound? Thompson: The sound is decomposed into its component frequencies by the cochlea. Each frequency in the hearing range displaces maximally the basilar membrane at some position/place according to its frequency; hence the frequency to place transformation. Von Bekesy attempted to explain this transformation merely by the mechanical properties of the basilar
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Unformatted text preview: membrane. It works to a first approximation, but the tuning of the auditory nerve fibers is far too narrow to be explained only by this property of the basilar membrane. There are efferents that, when they activate the outer hair cells, these hair cells move; this in turn moves the basilar membrane. There is believed to be a feedback system whereby the activity of hair cells activated most strongly due to von Bekesy's mechanics feedback through the outer hair cells to amplify the movements of the basilar membrane at this locale, sharpening the tuning of those hair cells--amplyifying their response but not that of adjacent hair cells responding better to other frequencies....
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This note was uploaded on 05/12/2010 for the course BIO 365R taught by Professor Draper during the Spring '08 term at University of Texas.

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