Post on 14-Dec-2015
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IIII Acoustic RealityAcoustic Reality
II.2 II.2 (M Sept 21) (M Sept 21) Hearing with Ear and BrainHearing with Ear and Brain
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malleusmalleus
incusincusstapesstapes
semicircular channels semicircular channels cochleacochlea
ear drumear drum
auricleauricle
1 cm1 cm22
20-fold reinforcement20-fold reinforcement
enters the upper (oval) window of cochleaenters the upper (oval) window of cochlea
2.5 windings2.5 windings30 mm length30 mm length
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inner hair cellsinner hair cells outer hair cellsouter hair cells basilar membranebasilar membrane
tectorial membranetectorial membrane
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1 mm1 mm
scalascalamediamedia
scalascalatympanitympani
scalascalavestibulivestibuli
auditory nerveauditory nerve
oval oval windowwindow
perilymphperilymphliquidliquid
endolymphendolymphliquidliquid
1010-8-8 cm in 1/200 sec cm in 1/200 sec 24‘000 hair cells24‘000 hair cells
30-50 stereo-30-50 stereo-andand1 kino-ciliae1 kino-ciliae
Corti organCorti organ
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helicotremahelicotremastapesstapes
round round windowwindow
high frequencieshigh frequencies
low frequencieslow frequencies
George von Békésy 1960, George von Békésy 1960, Harvard U, Nobel prizeHarvard U, Nobel prize
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nervus cochlearisnervus cochlearis
nucleus cochlearisnucleus cochlearis
nuclei superiores olivaenuclei superiores olivae
corpus geniculatum medialecorpus geniculatum mediale
colliculus inferiorcolliculus inferior
gyri Heschlgyri Heschl
30‘000 nerve „cables“30‘000 nerve „cables“
4 major transformations of data!4 major transformations of data!