PSYC 260 Lecture Notes - Hearing Aid, Mismatch Negativity, Hair Cell

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Blindness deprives you of contact with things; deafness deprives you of contact with people. Amplitude represents intensity of sound (measured in db as sound pressure) and perceived by us as loudness (but note that amplitude is not the only determinant of loudness) Frequency is the cycles of sound per second and perceived as pitch. Pinna = structure of flesh and cartilage attached to each side of the head that alters the reflections of sound waves and helps us locate the source of a sound. Malleus, incus, and stapes (a. k. a. hammer, anvil, & stirrup) Helps to attenuate the sounds we make ourselves. People with damage to middle ear complain that inner sounds (e. g. swallowing) are annoyingly loud. Cochlear is about 4 mm in diameter. For the basilar membrane, it is 5 times wider at the apex than at the base. People can normally detect pitch difference of about 2 hz to 2000 hz.

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