PSYCH 3A03 Lecture Notes - Information Theory, Band-Pass Filter, Stria Vascularis Of Cochlear Duct
5 Nov 2013
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Spl that is most sensitive to = characteristic frequency. Basal end of basilar membrane vibrates best to high frequencies but also responds to low frequencies. Apical end of basilar membrane vibrates only to low frequencies. There is a time lag between stapes motion and movement of apical end of basilar membrane. A given frequency causes a particular region to vibrate maximally: the characteristic frequency (cf) Adjacent regions, particularly toward the base, also vibrate b. m. but less so than the freq that causes maximum displacement. Plot of spl versus freq to reach same amplitude of displacement reveal bandpass filter function. 8. 35khz tone is point of maximum displacement. : this point of b. m. is tuned to 8. 35khz. Region were the amplitude is high at 8. 35khz (lower sound level) Input-output function showing b. m. velocity vs. spl for 9 & 1 khz tones. Cf for this region of the b. m. is 9khz. Motion of basilar membrane is not entirely linear with respect to spl.
