PSY100H1 Chapter Notes - Chapter 4.3: Basilar Membrane, Auditory Cortex, Sound
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PSY100H1 Full Course Notes
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Ear detects sound waves to transform to neural signals. Channels waves to ear & determines source of sound. Middle ear consists of bones called ossicles. Ossicles attach to cochlea: fluid filled membrane coiled in a snail shape and contains structures that convert sound into neural impulses. Hair-like projections that line the basilar membrane of the cochlea convert sounds into neural impulses. Auditory nerves have nerve cells that fire because of hair cell movements. Auditory nerves send signals to thalamus and then to the auditory cortex in temporal lobe. Take advantage of time difference between sound hitting both ears. Left ear will receive sound coming from left seconds before right does. Use differences in intensity in which sound is heard by both ears. If sound is to left, left ear will hear it more intensely because right ear is in. Place theory of hearing: how pitch is perceived is based on location along basilar membrane that sound stimulates.