Study of mechanical motions in the basal region of the chinchilla cochlea

Rhode, William S.; Recio, Alberto

doi:10.1121/1.429404

Cited by 163 publications

(183 citation statements)

References 37 publications

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“…However, reverse effects were found in a minority of ANFs (panels B and F). The CF specificity of the rate-level slopes of low-CF ANFs probably indicates the presence of a CFspecific nonlinearity at the input to the IHC stereocilia, as is the case at the base of the cochlea, where the nonlinearity of vibrations of the BM/organ of Corti/tectorial membrane complex are CF specific (Rhode 2007;Rhode and Recio 2000;Ruggero et al 1997).…”

Section: Cf-specific Variation Of Anf Rate-level Curvesmentioning

confidence: 99%

Phase-Locked Responses to Tones of Chinchilla Auditory Nerve Fibers: Implications for Apical Cochlear Mechanics

Temchin

Ruggero

2009

JARO

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Responses to tones with frequency ≤5 kHz were recorded from auditory nerve fibers (ANFs) of anesthetized chinchillas. With increasing stimulus level, discharge rate-frequency functions shift toward higher and lower frequencies, respectively, for ANFs with characteristic frequencies (CFs) lower and higher than ∼0.9 kHz. With increasing frequency separation from CF, rate-level functions are less steep and/or saturate at lower rates than at CF, indicating a CF-specific nonlinearity. The strength of phase locking has lower high-frequency cutoffs for CFs 94 kHz than for CFsG 3 kHz. Phase-frequency functions of ANFs with CFs lower and higher than ∼0.9 kHz have inflections, respectively, at frequencies higher and lower than CF. For CFs 92 kHz, the inflections coincide with the tiptail transitions of threshold tuning curves. ANF responses to CF tones exhibit cumulative phase lags of 1.5 periods for CFs 0.7-3 kHz and lesser amounts for lower CFs. With increases of stimulus level, responses increasingly lag (lead) lower-level responses at frequencies lower (higher) than CF, so that group delays are maximal at, or slightly above, CF. The CF-specific magnitude and phase nonlinearities of ANFs with CFsG2.5 kHz span their entire response bandwidths. Several properties of ANFs undergo sharp transitions in the cochlear region with CFs 2-5 kHz. Overall, the responses of chinchilla ANFs resemble those in other mammalian species but contrast with available measurements of apical cochlear vibrations in chinchilla, implying that either the latter are flawed or that a nonlinear "second filter" is interposed between vibrations and ANF excitation.

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Section: Cf-specific Variation Of Anf Rate-level Curvesmentioning

confidence: 99%

Phase-Locked Responses to Tones of Chinchilla Auditory Nerve Fibers: Implications for Apical Cochlear Mechanics

Temchin

Ruggero

2009

JARO

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“…The models have been developed based on findings from direct mechanical measurements in experimental animals that were performed primarily at basal sites of the cochlea, which can be accessed with little effect on the cochlea's physiological function (Rhode, 1971;Rhode and Robles, 1974;Robles et al, 1986;Ruggero et al, 1997;Robles and Ruggero, 2001;Rhode, 2007). Only a few studies have provided data from apical sites, and those have acknowledged that the response characteristics might have been compromised by the procedures used to gain physical access to the apex Rhode, 1995, 1996;Rhode and Cooper, 1996;Khanna and Hao, 1999;Zinn et al, 2000). Due to the mechanical properties of the BM, the peak responses to different frequency components occurring at their respective CF places have different latencies.…”

Section: Introductionmentioning

confidence: 99%

Perception of across-frequency asynchrony and the role of cochlear delays

Wojtczak

Beim

Micheyl

et al. 2012

The Journal of the Acoustical Society of America

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Cochlear filtering results in earlier responses to high than to low frequencies. This study examined potential perceptual correlates of cochlear delays by measuring the perception of relative timing between tones of different frequencies. A brief 250-Hz tone was combined with a brief 1-, 2-, 4-, or 6-kHz tone. Two experiments were performed, one involving subjective judgments of perceived synchrony, the other involving asynchrony detection and discrimination. The functions relating the proportion of "synchronous" responses to the delay between the tones were similar for all tone pairs. Perceived synchrony was maximal when the tones in a pair were gated synchronously. The perceived-synchrony function slopes were asymmetric, being steeper on the low-frequency-leading side. In the second experiment, asynchrony-detection thresholds were lower for low-frequency rather than for high-frequency leading pairs. In contrast with previous studies, but consistent with the first experiment, thresholds did not depend on frequency separation between the tones, perhaps because of the elimination of within-channel cues. The results of the two experiments were related quantitatively using a decision-theoretic model, and were found to be highly correlated. Overall the results suggest that frequency-dependent cochlear group delays are compensated for at higher processing stages, resulting in veridical perception of timing relationships across frequency.

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“…This static compressive I-O nonlinearity is a direct consequence of the limited range of stimulus levels for which the cochlear amplifier effectively operates (e.g. Nuttall and Dolan, 1996;Rhode and Recio, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…As the cochlear amplifier begins to overload at levels above 25 dB sensation level (e.g. Nuttall and Dolan, 1996;Rhode and Recio, 2000), presentation of tone bursts at 60 dB p.e. SPL would be expected to cause the response characteristic of the cochlea to be nonlinear.…”

mentioning

confidence: 99%

A mechanism for simultaneous suppression of tone burst-evoked otoacoustic emissions

et al. 2012

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Tone burst-evoked otoacoustic emission (TBOAE) components in response to a 1-kHz tone burst are suppressed by the simultaneous presence of tone bursts at higher frequencies. To date, the underlying cause of this "simultaneous suppression" of TBOAEs is unclear. This paper describes a potential mechanism based on local nonlinear interactions between basilar membrane (BM) travelling waves, and tests the extent to which it is able to account for this specific suppression phenomenon. A simple mathematical model based on local nonlinear interactions was developed, and its predictions for a range of tone burst pairs were compared to corresponding TBOAE suppression data recorded from fourteen normally-hearing human ears at a level of 60 dB p.e. SPL. Model predictions and mean TBOAE suppression data showed close agreement for all pairs of tone bursts. These results suggest that simultaneous suppression of TBOAEs can be explained solely in terms of the local nonlinear interactionbased mechanism. However, the involvement of other mechanisms, involving components generated at places basal to their characteristic place along the BM, cannot be excluded.

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Study of mechanical motions in the basal region of the chinchilla cochlea

Cited by 163 publications

References 37 publications

Phase-Locked Responses to Tones of Chinchilla Auditory Nerve Fibers: Implications for Apical Cochlear Mechanics

Phase-Locked Responses to Tones of Chinchilla Auditory Nerve Fibers: Implications for Apical Cochlear Mechanics

Perception of across-frequency asynchrony and the role of cochlear delays

A mechanism for simultaneous suppression of tone burst-evoked otoacoustic emissions

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