NPB+112+2011+auditory

NPB+112+2011+auditory - NPB 112, Winter 2011 Lecture...

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1 NPB 112, Winter 2011 Lecture outline: 2-22-11 Auditory system (Ch. 13) I. Sound II. Cochlear transduction III. Cochlear hair cells IV. Frequency discrimination A. Cochlear mechanics B. Place principal C. Auditory nerve fiber tuning curves D. Volley principal and phase locking II. Auditory pathway A. Sound localization B. Auditory cortex and tonotopic organization III. Language Fig. 13.1 Sound= air pressure waves generated by vibrating air molecules Humans: 100 to 20,000 Hz Amplitude (loudness) Frequency (pitch)
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2 Sound pressure level (SPL) • SPL= 20 log P test /P reference •P reference = sound that is just noticeable (20 uN/mm 2 ) • Loudness expressed in decibel (dB)- log scale • Just-noticeable difference between two tones increases logarithmically as tones get louder (easier to tell 2 soft tones apart than 2 loud tones) – Normal conversation: 65 decibel – electro-house band 110 decibels Fig. 13.3
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Fig. 13.3 Sound in air (low impedance) 99.9% reflected from tympanic membrane (high impedance medium) 0.1% of energy absorbed by tympanic membrane, with large area, is focused on small area of oval window. This boosts the pressure 200- fold. (Like getting stepped on by spiked heel) Fig. 13.3 Sound in air (low impedance) 99.9% reflected from tympanic membrane (high impedance medium) 0.1% of energy absorbed by tympanic membrane, with large area, is focused on small area of oval window. This boosts the
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NPB+112+2011+auditory - NPB 112, Winter 2011 Lecture...

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