BIO 208 Lecture Notes - Lecture 18: Somatotopic Arrangement, Cochlea, Hearing Loss

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The human ear: sound waves lead to vibration of basilar membrane (through conversion of other vibration of other membrane (tympanic) Basilar = coiled, in the cochlea: hair cell bending from vibration of the basilar membrane in the organ of. The distribution of frequencies on the basilar membrane: each frequency decade occupies the same distance on the basilar membrane, different pitches, diff parts of cochlea vibrate to diff frequencies, high = basal part, low = distal part. E at the same time as impulses produced by the sound arriving via the right ear. You turn your head to resolve the direction of these sounds. Auditory cortex: temporal lobe, columnar organization similar to other primary cortical areas (somatotopic and visual)- frequency columns, monaural, and binaural columns- some columns tell location and some columns relate to frequency. Can be changed with experience: binaural columns input from both ears (function not well understood- but presumably related to sound localization).

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