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PSYCH 2E03 (70)
Lecture

Theories of Hearing (1).docx
Theories of Hearing (1).docx

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School
McMaster University
Department
Psychology
Course
PSYCH 2E03
Professor
Gautam Ullal
Semester
Fall

Description
November 26 , 2012 Psych 2B03: Sensory Processes Theories of Hearing (1) Sound source (what?) quality discrimination - theories of hearing:  telephone theory  place theory  traveling wave theory - temporal coding and the volley principle of impulse conduction - cortical processing of sound Rutherford’s telephone theory (1800’s) - the entire basilar membrane vibrates at different frequencies (human: 20- 20,000Hz) resonating with the frequencies of the sound source (we know this is not true) - auditory nerves conduct impulses accordingly (20-20,000Hz) (but no neuron can fire >2000Hz) Place theory (von Bekesy): 1900’s - different regions (places) on basilar membrane vibrate resonating with the frequencies of the sound source (this is called, frequency or tonotopic map of the basilar membrane) - different sets of neurons conduct impulses from the hair cells along the basilar membrane Evidence for the place theory - tonotopic map:  cochlea shows an orderly map of frequencies along its length  apex responds best to low frequencies  base responds best to high frequencies Traveling wave theory of Bekesy - a traveling wave is generated along the basilar membrane from locations determined by the frequency of sound Traveling waves along the cochlea Bekesys’ traveling-wave theory of hearing - envelope of the traveling wave  indicates the point of maximum d
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