Systems close to bifurcations can be used as small-signal amplifiers. Biophysical measurements suggest that the active amplifiers present in the mammalian cochlea are systems close to a Hopf bifurcation. The pure tone and transient signal output of our electronic hearing sensor based on this observation provides output that is fully compatible with the electrophysiological data from the mammali...

The laser Doppler flowmeter has been shown to give a response from the cochlea during high intensity acoustic stimulation which is not related to blood flow through the cochlea. The magnitude of this response depends upon the intensity and frequency of stimulation and the location of the probe on the cochlea. Evidence is presented that the response is derived from the vibration of cochlear tiss...

BACKGROUND Tonotopy is one of the most fundamental principles of auditory function. While gradients in various morphological and physiological characteristics of the cochlea have been reported, little information is available on gradient patterns of gene expression. In addition, the audiograms in autosomal dominant non syndromic hearing loss can be distinctive, however, the mechanism that accou...

Afferent regulation of neurons in the cochlear nucleus as a function of age was investigated at the light microscope level. Unilateral cochlea removal was performed on Mongolian gerbils of three age groups: 1, 8, and 20 weeks postnatal. Animals survived for either 2 days or 2 weeks. An additional group of neonatally operated animals had a prolonged survival of 9 weeks. The number of neurons in ...

In den vergangenen 5 Jahren wurden zunehmend mehr Patienten mit hochgradiger Schwerhörigkeit oder frequenzselektiver, partieller Taubheit mit einem Cochlea-Implantat (CI) versorgt. Dabei soll das Resthörvermögen erhalten bleiben. Dies kann erzielt werden, wenn während der Einführung der Elektrode in die Hörschnecke die Feingewebsstrukturen der Hörschnecke (Cochlea) nicht verletzt werden. Ein Ma...

Objective. Inhibition of inflammation and free radical formation in the cochlea may be involved in antioxidant treatment in acute acoustic trauma. Procedure. Chinchilla were exposed to 105 dB sound pressure level octave band noise for 6 hours. One group of chinchilla was treated with antioxidants after noise exposure. Auditory brainstem responses, outer hair cell counts, and immunohistochemical...

The auditory system provides a natural frequency-to-place mapping which is designated as tonotopic organisation of the cochlea. In the normal-hearing system, the acoustic signal causes a fluid pressure wave which propagates into the cochlea. At particular positions within the cochlea, most of the energy of the wave is absorbed causing mechanical oscillations of the basilar membrane. The oscilla...

Kölliker's organ is a temporary but indispensable structure in the development of the cochlea. Supporting cells (SCs) within it release adenosine 5'-triphosphate (ATP), which may play a crucial role in cochlear development before the onset of hearing. To reveal the apoptosis of Kölliker's organ in new-born rats, we studied the morphological changes and expression of apoptosis-related factors du...

Evaluation of the speech, spatial and qualities hearing in unilateral bimodal cochlear implant users with incomplete partition type II Objective: The aim this study was to perform a scale-based assessment abilities IP malformation normal cochlea, including discrimination, orientation, positioning speech environmental sounds their environment. Material Methods: A total 30 users, 15 participants ...