PSYCH 1XX3 Study Guide - Final Guide: Hair Cell, Cochlear Nucleus, Coevolution
10 Jul 2018
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Document Summary
Sound waves don"t make sound unless an auditory system is present to translate the. Species vary in the range of frequencies they can detect waves into the perceptual experience of audition. Sound waves are vibrations in air particles. Condensed bands of air particles ripple away from the sound source. These alternating bands of more and less compressed air molecules interact with the eardrum to begin auditory processing. A band of compressed air molecules causes your eardrum to get pushed slightly inwards, whereas a band of less dense air particles causes the eardrum to move outwards. Pressure changes in sound waves can be graphed as a sine wine. Amplitude= loudness, wavelength= pitch, purity= timbre (complexity of the sound) The ear can be divided into three sections. Each inner hair cell communicates with roughly 20 afferent fibers (direct links to the brain) The inner hair cells establish the exact pitch of the sound stimulus.
