Travelling Wave Motion along the Pigeon Basilar Membrane

ORL ◽  
1986 ◽  
Vol 48 (2) ◽  
pp. 93-97 ◽  
Author(s):  
Jean W.T. Smolders ◽  
Anthony W. Gummer ◽  
Rainer Klinke
Keyword(s):  
Wave Motion ◽  
Basilar Membrane ◽  
Travelling Wave

A fully coupled subwavelength resonance approach to filtering auditory signals

2019 ◽  
Vol 475 (2228) ◽  
pp. 20190049 ◽  
Author(s):  
Habib Ammari ◽  
Bryn Davies
Keyword(s):  
Basilar Membrane ◽  
Travelling Wave ◽  
Frequency Separation ◽  
Mathematical Explanation ◽  
Layer Potential ◽  
Cochlear Hair Cells ◽  
Resonant Modes ◽  
Acoustic Pressure Wave ◽  
Frequency Map ◽  
Set Up

The aim of this paper is to understand the behaviour of a large number of coupled subwavelength resonators. We use layer potential techniques in combination with numerical computations to study an acoustic pressure wave scattered by a graded array of subwavelength resonators. Using this approach, the spatial frequency separation properties of such an array can be understood. Our set-up is inspired by the graded structure of cochlear hair cells on the surface of the basilar membrane. We compute the resonant modes of the system and explore the model's ability to decompose incoming signals. We propose a mathematical explanation for phenomena identified with the cochlea's ‘travelling wave’ behaviour and tonotopic frequency map.

New Efficient Stimuli for Evoking Frequency-Specific Auditory Steady-State Responses

2006 ◽  
Vol 17 (06) ◽  
pp. 448-461 ◽  
Author(s):  
Ekkehard Stürzebecher ◽  
Mario Cebulla ◽  
Claus Elberling ◽  
Thomas Berger
Keyword(s):  
Basilar Membrane ◽  
Low Frequency ◽  
Travelling Wave ◽  
Detection Rates ◽  
Promising Tool ◽  
Sample Test ◽  
Steady State Responses ◽  
Specific Assessment ◽  
Auditory Steady State Responses ◽  
Stimulus Design

ASSR is a promising tool for the objective frequency-specific assessment of hearing thresholds in children. The stimulus generally used for ASSR recording (single amplitude-modulated carrier) only activates a small area on the basilar membrane. Therefore, the response amplitude is low. A stimulus with a broader frequency spectrum can be composed by adding several cosines whose frequency intervals comply with the desired stimulus repetition rate. Compensation of the travelling wave delay on the basilar membrane is possible with a stimulus of this type. Through this, a better synchronization of the neural response can be obtained and, as a result, higher response amplitudes can be expected, particularly for low-frequency stimuli. The additional introduction of a frequency offset enables the use of a q-sample test for the response detection, especially important at 500 Hz. The results of investigations carried out on a large group of normally hearing test subjects have confirmed the efficiency of this stimulus design. The new stimuli lead to significantly improved ASSRs with higher SNRs and thus higher detection rates and shorter detection times.

scholarly journals МОДЕЛЮВАННЯ ЗАВИТКИ ВНУТРІШНЬОГО ВУХА ЛЮДИНИ

2012 ◽  
Author(s):  
S. A. Naida ◽  
О. A. Zubchenko
Keyword(s):  
Resonance Frequency ◽  
Sound Pressure ◽  
Basilar Membrane ◽  
Travelling Wave ◽  
Oval Window ◽  
Long Line

<p>There was conducted the simulations of a cochlea of an interior ear of the human by means of a long line. The following regularities of operation of a cochlea were determined: without the count of flexibilities Reissner's and basilar membranes swing pressure on walls of a cochlear course does not exceed 3,6 % from pressure in the field of an oval window; allocation of a differential of sound pressure fluctuates in a time with frequency; taking into account the slenderness of a membrane and dependence of a standing of resonances from <em>f </em>are spotted by non-uniformity of a basilar membrane; the differential travelling wave exists only near to a resonance on each  frequency where the amplitude buildup of oscillations to a maximum happens for many continuances of resonance frequency.</p><p>Small relative meaning of range of pressure of travelling wave could become the parent of that Peterson's and Bogert's work has not had the further evolution.</p>

Verification of a new test of endolymphatic hydrops

1989 ◽  
Vol 103 (12) ◽  
pp. 1136-1139 ◽  
Author(s):  
A. R. D. Thornton ◽  
G. Farrell ◽  
A. J. Phillips ◽  
N. P. Haacke ◽  
S. Rhys-Williams
Keyword(s):  
Blood Sample ◽  
Wave Velocity ◽  
Basilar Membrane ◽  
Endolymphatic Hydrops ◽  
Plasma Osmolality ◽  
Prognostic Indicator ◽  
Auditory Brainstem ◽  
Travelling Wave ◽  
Lemon Juice ◽  
Brainstem Response

AbstractA new objective test of endolymphatic hydrops has been described previously. The test uses auditory brainstem response (ABR) techniques to estimate the basilar membrane travelling wave velocity (TWV). The underlying hypothesis is that raised pressure in the scala media will lead to an increase in the stiffness of the basilar membrane and that this will give rise to a travelling wave velocity that is greater than normal.It was considered that verification of the technique could be obtained by carrying out the new test before and during a glycerol dehydration procedure. Patients who required this procedure for verification of the diagnosis or as a prognostic indicator for sacculotomy, underwent the following tests. Prior to dehydration an audiogram, the ABR TWV test and a blood sample (for plasma osmolality) were taken. The patient was then given the appropriate amount of glycerol mixed with lemon juice and laid on a bed in a test room. The audiogram and a blood sample were repeated every hour and the ABR TWV test was repeatedly carried out every twenty minutes between the other tests.Six of these procedures have been carried out. In five of them the 0.5 and 1kHz average threshold improved by at least 10dB and in all those cases the ABR TWV test showed an abnormal pre-dehydration result which moved towards the normal value following dehydration. One patient gave ABR TWV results that were within normal limits before and during the procedure and gave an audiometric change of only 5dB.These data indicate that the ABR TWV test does detect endolymphatic hydrops. The additional hardware to carry out this test has been constructed and parallel clinical trials at IHR Southampton, Addenbrooke's Hospital, Cambridge, and Queen's Medical Centre, Nottingham, are in hand.

Electrophysiological Evidence of the Basilar-Membrane Travelling Wave and Frequency Place Coding of Sound in Cochlear Implant Recipients

2017 ◽  
Vol 22 (3) ◽  
pp. 180-189 ◽  
Author(s):  
Luke Campbell ◽  
Christofer Bester ◽  
Claire Iseli ◽  
David Sly ◽  
Adrian Dragovic ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Direct Evidence ◽  
Basilar Membrane ◽  
Diagnostic Value ◽  
Travelling Wave ◽  
Phase Delay ◽  
Neural Function ◽  
Specific Information ◽  
Auditory Prosthesis ◽  
Frequency Dependent

Aim: To obtain direct evidence for the cochlear travelling wave in humans by performing electrocochleography from within the cochlea in subjects implanted with an auditory prosthesis. Background: Sound induces a travelling wave that propagates along the basilar membrane, exhibiting cochleotopic tuning with a frequency-dependent phase delay. To date, evoked potentials and psychophysical experiments have supported the presence of the travelling wave in humans, but direct measurements have not been made. Methods: Electrical potentials in response to rarefaction and condensation acoustic tone bursts were recorded from multiple sites along the human cochlea, directly from a cochlear implant electrode during, and immediately after, its insertion. These recordings were made from individuals with residual hearing. Results: Electrocochleography was recorded from 11 intracochlear electrodes in 7 ears from 6 subjects, with detectable responses on all electrodes in 5 ears. Cochleotopic tuning and frequency-dependent phase delay of the cochlear microphonic were demonstrated. The response latencies were slightly shorter than those anticipated which we attribute to the subjects' hearing loss. Conclusions: Direct evidence for the travelling wave was observed. Electrocochleography from cochlear implant electrodes provides site-specific information on hair cell and neural function of the cochlea with potential diagnostic value.

Basilar membrane measurements and the travelling wave

1986 ◽  
Vol 22 (1-3) ◽  
pp. 147-153 ◽  
Author(s):  
B.M. Johnstone ◽  
R. Patuzzi ◽  
G.K. Yates
Keyword(s):  
Basilar Membrane ◽  
Travelling Wave

scholarly journals Steady streaming in a two-dimensional box model of a passive cochlea

2014 ◽  
Vol 753 ◽  
pp. 254-278 ◽  
Author(s):  
Elisabeth Edom ◽  
Dominik Obrist ◽  
Leonhard Kleiser
Keyword(s):  
Basilar Membrane ◽  
Low Frequency ◽  
Acoustic Stimulation ◽  
Travelling Wave ◽  
Steady Streaming ◽  
Compliant Structure ◽  
Physiological Relevance ◽  
Theoretical Predictions ◽  
New Phenomena ◽  
Streaming Flow

AbstractAcoustic stimulation of the cochlea leads to a travelling wave in the cochlear fluids and on the basilar membrane (BM). It has long been suspected that this travelling wave leads to a steady streaming flow in the cochlea. Theoretical investigations suggested that the steady streaming might be of physiological relevance. Here, we present a quantitative study of the steady streaming in a computational model of a passive cochlea. The structure of the streaming flow is illustrated and the sources of streaming are closely investigated. We describe a source of streaming which has not been considered in the cochlea by previous authors. This source is also related to a steady axial displacement of the BM which leads to a local stretching of this compliant structure. We present theoretical predictions for the streaming intensity which account for these new phenomena. It is shown that these predictions compare well with our numerical results and that there may be steady streaming velocities of the order of millimetres per second. Our results indicate that steady streaming should be more relevant to low-frequency hearing because the strength of the streaming flow rapidly decreases for higher frequencies.

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