13Audition - Audition An amazing sensory modality Sound =...

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Audition An amazing sensory modality
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Sound = pressure waves Waves have Amplitude --> loudness Frequency --> pitch
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Figure 13.1 The periodic condensation and rarefaction of air molecules produced by a tuning fork
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Audible spectrum 20 Hz to 20 kHz (Visible spectrum is about 400-650 nM) Optimal hearing ~ 3 kHz A = 440 Hz
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Ears External ear Designed to collect sound waves and focus them on ear drum, esp. waves in the 3 kHz range Filter sounds of different pitches to provide cues about elevation of sound source
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Figure 13.3 The human ear
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Anatomical features--> Middle ear designed to overcome impedance of inner ear (which is fluid filled) Impedance = P/DV, in which P = pressure and DV = displacement vol. • Imp air < Imp water Force exerted on TM is translated to small OW P =F/A
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Inner ear - where signal transduction for hearing begins Cochlear anatomy Apical
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The cochlea (Part 2)
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This note was uploaded on 11/09/2011 for the course CHEM 2341 taught by Professor Staff during the Fall '11 term at Texas State.

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13Audition - Audition An amazing sensory modality Sound =...

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