Andrei Temchin - PowerPoint PPT Presentation

Title: Andrei Temchin


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Shyamla Narayan
Alberto Recio
Ed Overstreet
Andrei Temchin
Burt Evans
Laboratory for Hearing Biology (1996)
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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
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GROWTH OF PEAKS IN RESPONSES TO CLICKS AS A
FUNCTION OF STIMULUS LEVEL
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COMPRESSIVE NONLINEARITY IS PRESENT WITHIN A
SINGLE PERIOD OF RESPONSE OSCILLATION
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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
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SECOND-ORDER WIENER KERNELS OF AUDITORY-NERVE
FIBERS RESPONSES TO NOISE
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FRONT, GROUP AND FILTER DELAYS
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MAP OF DELAYS FOR THE CHINCHILLA COCHLEA
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COMPARISON OF GROUP DELAYS OF BASILAR-MEMBRANE
VIBRATIONS AND STIMULUS-FREQUENCY
OTOACOUSTIC EMISSIONS (SFOAEs)
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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
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BASAL RESPONSES ARE NOT MINIMUM-PHASE
44 dB SPL 104 dB SPL
(frequency domain)
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THE MEASURED PHASE SHIFTS AS A FUNCTION OF GAIN
ARE MUCH SMALLER THAN EXPECTED FROM
MINIMUM-PHASE BEHAVIOR
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EVEN POST-MORTEM RESPONSES ARE NOT MINIMUM-PHASE
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BASILAR-MEMBRANE RESPONSES AT THE APEX OF THE
COCHLEA ARE NOT MINIMUM-PHASE
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DEVELOPMENT OF BASILAR-MEMBRANE VIBRATIONS IN
NEW-BORN GERBILS RUDIMENTARY TRAVELING WAVE
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POST-MORTEM BASILAR-MEMBRANE RESPONSES IN ADULT
GERBIL ARE NOT MINIMUM-PHASE
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BUT IN-VIVO BASILAR-MEMBRANE RESPONSES IN
IMMATURE COCHLEAE ARE MINIMUM-PHASE