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Andrei Temchin

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Shyamla Narayan. Alberto Recio. Ed Overstreet. Andrei Temchin. Burt Evans. Laboratory for Hearing Biology (~1996). Laboratory for Hearing Biology (today). Luis Robles. Jon Siegel. Andrei Temchin. Yun-Hui Fan. Qin Gong. Yi-Bo Fan.

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Presentation Transcript
slide1

Shyamla Narayan

Alberto Recio

Ed Overstreet

Andrei Temchin

Burt Evans

Laboratory for Hearing Biology (~1996)

slide2

Laboratory for

Hearing Biology (today)

Luis Robles

Jon Siegel

Andrei Temchin

Yun-Hui Fan

Qin Gong

Yi-Bo Fan

slide10

AT THE BASE OF THE COCHLEA, BASILAR-MEMBRANE RESPONSES TO CHARACTERISTIC-FREQUENCY TONES GROW AT HIGHLY COMPRESSIVE RATES (e.g., 0.2 dB/dB)

chinchilla

guinea pig

cat

slide13

COMPRESSIVE NONLINEARITY IN

BASILAR-MEMBRANE RESPONSES

TO CLICKS

slide14

IN SPITE OF THE PROMINENT

NONLINEARITIES OF BASILAR-MEMBRANE

VIBRATIONS, THE FOURIER SPECTRA OF

RESPONSES TO CLICKS MATCH, LEVEL

BY LEVEL, THE RESPONSES TO TONES

slide15

GROWTH OF PEAKS IN RESPONSES TO

CLICKS AS A FUNCTION OF STIMULUS

LEVEL

slide16

COMPRESSIVE NONLINEARITY IS

PRESENT WITHIN A SINGLE PERIOD

OF RESPONSE OSCILLATION

slide17

IN THE CHINCHILLA, BASILAR-MEMBRANE

RESPONSES ARE MORE SHARPLY TUNED

AND EXHIBIT GREATER NONLINEARITY

AT THE BASE OF THE COCHLEA THAN AT

THE APEX

slide27

Compression and other nonlinearities of BM

responses probably arise in nonlinear transduction

in outer hair cells

Cooper, 2003

slide30

RESPONSES OF AUDITORY-NERVE FIBERS

EXHIBIT AN INTENSITY-DEPENDENT PHASE

SHIFT THAT IS NOT PRESENT IN BASILAR-

MEMBRANE RESPONSES

slide31

SECOND-ORDER WIENER KERNELS OF

AUDITORY-NERVE FIBERS RESPONSES

TO NOISE

slide33

MAP OF DELAYS FOR

THE CHINCHILLA COCHLEA

slide34

COMPARISON OF GROUP DELAYS OF

BASILAR-MEMBRANE VIBRATIONS AND

STIMULUS-FREQUENCY OTOACOUSTIC

EMISSIONS (SFOAEs)

slide35

BASILA-MEMBRANE RESPONSES AT

THE BASE OF THE COCHLEA ARE NOT

MINIMUM-PHASE

Original response Minimum-phase version

(time domain)

44 dB SPL

104 dB SPL

slide36

BASAL RESPONSES ARE NOT MINIMUM-PHASE

44 dB SPL 104 dB SPL

(frequency domain)

slide37

THE MEASURED PHASE SHIFTS AS A FUNCTION

OF GAIN ARE MUCH SMALLER THAN

EXPECTED FROM MINIMUM-PHASE BEHAVIOR

slide38

EVEN POST-MORTEM RESPONSES

ARE NOT MINIMUM-PHASE

slide39

BASILAR-MEMBRANE RESPONSES AT THE

APEX OF THE COCHLEA ARE NOT MINIMUM-PHASE

slide40

DEVELOPMENT OF BASILAR-MEMBRANE

VIBRATIONS IN NEW-BORN GERBILS:

RUDIMENTARY TRAVELING WAVE

slide41

POST-MORTEM BASILAR-MEMBRANE

RESPONSES IN ADULT GERBIL ARE NOT

MINIMUM-PHASE

slide42

BUT IN-VIVO BASILAR-MEMBRANE RESPONSES

IN IMMATURE COCHLEAE ARE MINIMUM-PHASE