Andrei Temchin - PowerPoint PPT Presentation

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Andrei Temchin

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... -order wiener kernels of auditory-nerve fibers responses to noise front, group and filter delays map of delays for the chinchilla cochlea ... – PowerPoint PPT presentation

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Title: Andrei Temchin


1
Shyamla Narayan
Alberto Recio
Ed Overstreet
Andrei Temchin
Burt Evans
Laboratory for Hearing Biology (1996)
2
Laboratory for Hearing Biology (today)
Luis Robles
Jon Siegel
Andrei Temchin
Yun-Hui Fan
Qin Gong
Yi-Bo Fan
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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
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COMPRESSIVE NONLINEARITY IN BASILAR-MEMBRANE
RESPONSES TO CLICKS
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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
15
GROWTH OF PEAKS IN RESPONSES TO CLICKS AS A
FUNCTION OF STIMULUS LEVEL
16
COMPRESSIVE NONLINEARITY IS PRESENT WITHIN A
SINGLE PERIOD OF RESPONSE OSCILLATION
17
IN THE CHINCHILLA, BASILAR-MEMBRANE RESPONSES ARE
MORE SHARPLY TUNED AND EXHIBIT GREATER
NONLINEARITY AT THE BASE OF THE COCHLEA THAN AT
THE APEX
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Compression and other nonlinearities of
BM responses probably arise in nonlinear
transduction in outer hair cells
Cooper, 2003
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RESPONSES OF AUDITORY-NERVE FIBERS EXHIBIT AN
INTENSITY-DEPENDENT PHASE SHIFT THAT IS NOT
PRESENT IN BASILAR- MEMBRANE RESPONSES
31
SECOND-ORDER WIENER KERNELS OF AUDITORY-NERVE
FIBERS RESPONSES TO NOISE
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FRONT, GROUP AND FILTER DELAYS
33
MAP OF DELAYS FOR THE CHINCHILLA COCHLEA
34
COMPARISON OF GROUP DELAYS OF BASILAR-MEMBRANE
VIBRATIONS AND STIMULUS-FREQUENCY
OTOACOUSTIC EMISSIONS (SFOAEs)
35
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
36
BASAL RESPONSES ARE NOT MINIMUM-PHASE
44 dB SPL 104 dB SPL
(frequency domain)
37
THE MEASURED PHASE SHIFTS AS A FUNCTION OF GAIN
ARE MUCH SMALLER THAN EXPECTED FROM
MINIMUM-PHASE BEHAVIOR
38
EVEN POST-MORTEM RESPONSES ARE NOT MINIMUM-PHASE
39
BASILAR-MEMBRANE RESPONSES AT THE APEX OF THE
COCHLEA ARE NOT MINIMUM-PHASE
40
DEVELOPMENT OF BASILAR-MEMBRANE VIBRATIONS IN
NEW-BORN GERBILS RUDIMENTARY TRAVELING WAVE
41
POST-MORTEM BASILAR-MEMBRANE RESPONSES IN ADULT
GERBIL ARE NOT MINIMUM-PHASE
42
BUT IN-VIVO BASILAR-MEMBRANE RESPONSES IN
IMMATURE COCHLEAE ARE MINIMUM-PHASE
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