Are human spontaneous otoacoustic emissions generated by a chain of coupled nonlinear oscillators?

2012 ◽  
Vol 132 (2) ◽  
pp. 918-926 ◽  
Author(s):  
Hero P. Wit ◽  
Pim van Dijk
Keyword(s):  
Otoacoustic Emissions ◽  
Nonlinear Oscillators ◽  
Spontaneous Otoacoustic Emissions ◽  
Coupled Nonlinear Oscillators ◽  
A Chain

scholarly journals Bilateral spontaneous otoacoustic emissions show coupling between active oscillators in the two ears

2018 ◽  
Author(s):  
Yuttana Roongthumskul ◽  
Daibhid O Maoileidigh ◽  
Albert Hudspeth
Keyword(s):  
Sound Localization ◽  
Otoacoustic Emissions ◽  
Nonlinear Oscillators ◽  
Acoustic Stimulation ◽  
Strongly Correlated ◽  
Spontaneous Otoacoustic Emissions ◽  
Acoustic Coupling ◽  
Tokay Gecko ◽  
Active Processes ◽  
The Relationship

Spontaneous otoacoustic emissions (SOAEs) are weak sounds that emanate from the ears of tetrapods in the absence of acoustic stimulation. These emissions are an epiphenomenon of the active process of the inner ear, which enhances the sensitivity of the auditory system to weak sounds, but their mechanism of production remains a matter of debate. To understand the relationship between SOAEs that we recorded simultaneously from the two ears of the tokay gecko, we developed a mathematical model of the eardrums as noisy nonlinear oscillators coupled by the air within the mouth of a lizard. We found that binaural emissions could be strongly correlated: some emissions occurred at the same frequency in both ears and were highly synchronized. Suppression of the emissions in one ear often changed the amplitude or shifted the frequency of emissions in the other. Decreasing the frequency of emissions from one ear by lowering its temperature usually reduced the frequency of the contralateral emissions. By according with the model, the results indicate that some SOAEs are generated bilaterally through acoustic coupling across the oral cavity. The model predicts that sound localization through the acoustic coupling between ears is influenced by the active processes of both ears.

Forcing of coupled nonlinear oscillators: studies of intersegmental coordination in the lamprey locomotor central pattern generator

1990 ◽  
Vol 64 (3) ◽  
pp. 862-871 ◽  
Author(s):  
T. L. Williams ◽  
K. A. Sigvardt ◽  
N. Kopell ◽  
G. B. Ermentrout ◽  
M. P. Remler
Keyword(s):  
Central Pattern Generator ◽  
Coupled Oscillators ◽  
Nonlinear Oscillators ◽  
Pattern Generator ◽  
Fictive Locomotion ◽  
Frequency Range ◽  
Intersegmental Coordination ◽  
Coupled Nonlinear Oscillators ◽  
Phase Lags ◽  
A Chain

1. This paper reports the results of an investigation of the basic mechanisms underlying intersegmental coordination in lamprey locomotion, by the use of a combined mathematical and biological approach. 2. Mathematically, the lamprey central pattern generator (CPG) is described as a chain of coupled nonlinear oscillators; experimentally, entrainment of fictive locomotion by imposed movement has been investigated. Interpretation of the results in the context of the theory has allowed conclusions to be drawn about the nature of ascending and descending coupling in the lamprey spinal CPG. 3. Theory predicts and data show that 1) the greater the number of oscillators in the chain, the smaller is the entrainment frequency range and 2) it is possible to entrain both above and below the rest frequency at one end but only above or below at the other end. 4. In the context of the experimental results, the theory indicates the following: 1) ascending coupling sets the intersegmental phase lags, whereas descending coupling changes the frequency of the coupled oscillators; 2) there are differences in the ascending and descending coupling other than strength; and it also suggests that 3) coupling slows down the oscillators.

scholarly journals Traveling wave solutions in a chain of periodically forced coupled nonlinear oscillators

2016 ◽  
Vol 325 ◽  
pp. 25-40 ◽  
Author(s):  
M. Duanmu ◽  
N. Whitaker ◽  
P.G. Kevrekidis ◽  
A. Vainchtein ◽  
J.E. Rubin
Keyword(s):  
Traveling Wave ◽  
Traveling Wave Solutions ◽  
Nonlinear Oscillators ◽  
Wave Solutions ◽  
Coupled Nonlinear Oscillators ◽  
A Chain

Frequency Clustering in a Chain of Weakly Coupled Oscillators

1997 ◽  
Vol 52 (8-9) ◽  
pp. 578-580 ◽  
Author(s):  
Thomas Kirner ◽  
Otto E. Rössler
Keyword(s):  
Numerical Simulation ◽  
Small Intestine ◽  
Coupled Oscillators ◽  
Nonlinear Oscillators ◽  
Conduction System ◽  
Linear Parameter ◽  
Weakly Coupled ◽  
Coupled Nonlinear Oscillators ◽  
A Chain ◽  
Frequency Gradient

Abstract A numerical simulation of a chain of diffusively coupled nonlinear oscillators with a linear parameter gradient exhibits clusters of frequencies. The intention was to investigate the frequency-gradient in the stimulus conduction system of the heart. The phenomenon generalizes earlier findings on “frequency plateaus” described in the 1960's by Nicholas Diamant as a model of small-intestine transport. This “waxing and waining” phenomenon is a version of chaos. Thus, subtle chaos in the heart and waxing and waining type chaos in the intestine may be related.

scholarly journals Experimental Observation of the Amplitude Death Effect in Two Coupled Nonlinear Oscillators

2000 ◽  
Vol 84 (23) ◽  
pp. 5312-5315 ◽  
Author(s):  
R. Herrero ◽  
M. Figueras ◽  
J. Rius ◽  
F. Pi ◽  
G. Orriols
Keyword(s):  
Experimental Observation ◽  
Nonlinear Oscillators ◽  
Amplitude Death ◽  
Coupled Nonlinear Oscillators
Sign in / Sign up

Export Citation Format

Share Document