2_hearing

2_hearing - Hearing Juan P Bello The human ear The human...

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Unformatted text preview: Hearing Juan P Bello The human ear The human ear Outer Ear The human ear Middle Ear The human ear Inner Ear The cochlea (1) It separates sound into its various components If uncoiled it becomes a tapering conical tube filled with fluid It is divided in two by the basilar membrane which is narrow and stiff at the oval window end, and wider and limber at the opposite end. * From howstuffworks.com The cochlea (2) Different parts of the membrane resonate at different frequencies - the energy of the fluid wave is released at the resonating position Low frequencies resonate at the far end of the membrane High frequencies resonate at the oval window end of the membrane Octave-related frequencies are separated by a similar length in the membrane (human logarithmic perception of frequency) The organ of Corti lies on the surface of the basilar membrane It contains thousands of hair cells that, when activated, send electrical impulses to the brain Frequency perception (1) For low-frequencies, impulses are synchronous with the wave Firing rates are usually very low (<150 Hz) so synchronicity is achieved by combining the outputs of several neurons High frequency (>4kHz) perception is driven by the localization of the active hair cells on the basilar membrane In the 200-4k Hz region, both strategies overlap time Waveform Neuron 1 Neuron 2 Neuron 3 All neurons Low frequency Mid frequency High frequency Frequency perception (2) The basilar membrane is a rough spectrum analyzer.The basilar membrane is a rough spectrum analyzer....
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This note was uploaded on 03/03/2012 for the course FMT E85 taught by Professor Juanpablobello during the Fall '09 term at NYU.

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2_hearing - Hearing Juan P Bello The human ear The human...

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