PSY 324 Chapter Notes - Chapter 7: Auditory Cortex, Semicircular Canals, Inner Ear
17 Apr 2016
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Most adult humans have an audible range of 15 hz 20 khz (i. e. 20,000 hz). The ability to perceive high frequencies decreases with age and exposure to loud noises. Outer ear = pinna helps locate source of sound. Middle ear = tympanic membrane/eardrum vibrates at same frequency as sound source and connects to three tiny bones by the oval window (membrane in inner ear) These bones are: hammer, anvil, stirrup in english or malleus, incus, stapes in latin. Hair cells excite the cells of auditory nerve, part of the 8th cranial nerve messages to brain. Inner ear = cochlea contains auditory receptors called hair cells that are displaced by fluid vibration. Amusia impaired detection of frequency changes or tone-deafness with genetic basis/thicker auditory cortex. A1 = primary auditory cortex in the superior temporal cortex (i. e. temporal lobe) Damage to this area and people become motion deaf cannot detect visual motion or motion of sounds.
