at the highest signal levels, the masking function for the off-frequency condition seems to become more linear. while some basilar membrane data show more linear growth at high levels, others do not. aim of the present study is to assess function of masking at high levels regarding its clinical appearance. in this experiment we evaluated the hearing thresholds of three different signals (wide-b...

Mass and stiffness affect on the peculiar characteristics of transmission of the middle ear and the distinctive behavior of the cochlear mechanics. Applying the principle of the mass and stiffness, the band-pass characteristic transfer function of the middle ear has been explained. The greatest transfer function of the middle ear, approximately 24-29 dB, is observed at 1-2 kHz in both cat and h...

OBJECTIVES Wideband acoustic immittance (WAI) measurements are capable of quantifying middle ear performance over a wide range of frequencies relevant to human hearing. Static pressure in the middle ear cavity affects sound transmission to the cochlea, but few datasets exist to quantify the relationship between middle ear transmission and the static pressure. In this study, WAI measurements of ...

The lack of baleen whale (Cetacea Mysticeti) audiograms impedes the assessment of the impacts of anthropogenic noise on these animals. Estimates of audiograms, which are difficult to obtain behaviorally or electrophysiologically for baleen whales, can be made by simulating the audiogram as a series of components representing the outer, middle, and inner ear (Rosowski, 1991; Ruggero and Temchin,...

OBJECTIVE To explain a clinical observation: a notch in the stimulus spectrum during transient evoked otoacoustic emission measurement in ears with secretory otitis media. METHODS The effects of tympanic under-pressure were investigated using a pressure chamber. A model of the ear canal was also studied. RESULTS Tympanic membrane reflectance increased as a consequence of increased stiffness...

Longitudinal changes in tympanometric measures of middle ear function over five years were reported for a large population of older adults. Findings were similar for men and women, for right and left ears, and across age groups from 48 to 92 years. Although some of the mean changes reached statistical significance, the vast majority of observed changes were small in magnitude relative to the ob...

Multifrequency, complex-component tympanograms and transient evoked otoacoustic emissions (EOAEs) were recorded in 55 neonates less than 24 hours of age. The purpose of the investigation was to determine the normal middle ear immittance characteristics of neonates less than 24 hours old (the approximate discharge age of well-babies) and to assess whether an association exists between transient ...

The level of the attenuation is strongly affected by the amount of leakage. The leakage through an earplug is traditionally divided into three parts; sound propagation between the earplug and the ear canal wall, vibration of the earplug and sound propagation through the material. The last leakage path is usually much less efficient than the two others. Simple models of these leakage paths can b...

Abstract: Objectives: Wideband acoustic immittance (WAI) measurements are capable of evaluating middle ear performance over a wide range of frequencies relevant to human hearing. It is known that static pressure in the middle ear cavity affects sound transmission to the cochlea, but only a few data sets exist to quantify the relationship between middle ear transmission and pressure level. The p...

introduction: cholesteatoma is traditionally diagnosed by otoscopic examination and treated by surgery. the necessity for imaging in an uncomplicated case is controversial. this study was planned to investigate the usefulness of a preoperative high-resolution computed tomography (hrct) scan in depicting the status of middle ear structures in the presence of cholesteatoma and also to compare the...