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Guerino Mazzola (Fall 2015©): Honrs Seminar II.1 Physical Reality II.1.2 (F Sept 16) Hearing with Ear and Brain 20-fold reinforcement malleus stapes Guerino Mazzola (Fall 2015©): Honrs Seminar incus enters the upper (oval) window of cochlea semicircular channels cochlea 2.5 windings 30 mm length ear drum auricle 1 cm2 Guerino Mazzola (Fall 2015©): Honrs Seminar oval window tectorial membrane Corti organ scala scala vestibuli media scala tympani 1 mm perilymph liquid auditory nerve endolymph liquid 10-8 cm in 1/200 sec 30-50 stereoand 1 kino-ciliae inner hair cells outer hair cells basilar membrane 24‘000 hair cells Guerino Mazzola (Fall 2015©): Honrs Seminar George von Békésy 1960, Harvard U, Nobel prize high frequencies low frequencies stapes round window helicotrema Guerino Mazzola (Fall 2015©): Honrs Seminar 4 major transformations of data! colliculus inferior nucleus cochlearis gyri Heschl corpus geniculatum mediale nuclei superiores olivae 30‘000 nerve „cables“ nervus cochlearis Guerino Mazzola (Fall 2015©): Honrs Seminar cat brain low pitch multiple representation of same pitch cochlea high pitch