Lecture September 28, 2007

Lecture September 28, 2007 - September 28, 2007 Hearing. o...

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September 28, 2007 Hearing. o Ear: Outer ear: Pressure changes go through the auditory canal. Reaches the eardrum causing the eardrum to vibrate. Three little bones translate the vibrations in the ear drum to a frequency in the oval window. The frequency goes through the cochlea, which perceives tone and sound, and enters the auditory nerve, which departs from cochlea to the brain. o Hearing range is between 20-20,000 Hertz. Greatest sensitivity is around 1,000 Hz. Lowest sensitivity is absolute threshold. o Hearing deficits. Conduction loss. Middle ear problem. o Thresholds are elevated equally at all frequencies. Sensory-neural loss. Inner ear problem. o Thresholds are elevated unequally at all frequencies. Common among the elderly and rock stars. o Pitch theories. Temporal Theory. Sound waves cause basilar membrane to vibrate. Vibration rate determines the firing rate of the nerve fiber.
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Lecture September 28, 2007 - September 28, 2007 Hearing. o...

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