Two experiments were performed for this study. The purpose of both experiments was to examine the validity of pure-tone hearing thresholds obtained near the rising portion of a sensorineural hearing loss. Recent work by other investigators has suggested that thresholds obtained near the rising portion of the audiogram may not correspond to the severity of damage at the cochlear place associated...

An infant Risso's dolphin (Grampus griseus) was rescued from the beach in Southern Portugal, and an audiogram was measured using auditory evoked potentials (AEP) and envelope following response (EFR) techniques for frequencies from 4 to 150 kHz. The stimuli used were custom sinusoidally amplitude-modulated (SAM) tone-bursts, and the AEP responses were collected, averaged and analyzed to quantif...

OBJECTIVE The objective was to identify and evaluate factors that may influence the recovery rate in patients with idiopathic sudden sensorineural hearing loss (ISSNHL). MATERIALS AND METHODS A retrospective analysis was performed for patients with sudden sensorineural hearing loss between 2009 and 2013. Those with an identified etiology were excluded. The patients were divided into four trea...

Some form of audiometric screening forms part of any comprehensive hearing conservation programme, but because of the large numbers of workers exposed to noise, it is suggested that routine audiometry using an 8-frequency test preceded by history and examination makes undue demands on limited resources. It is proposed that a simple 3-frequency test without prior preparation of subjects is adequ...

Design of a digital hearing aid requires a set of filters that gives reasonable audiogram matching for the concerned type of hearing loss. This paper proposes the use of a variable bandwidth filter, using Farrow subfilters, for this purpose. The design of the variable bandwidth filter is carried out for a set of selected bandwidths. Each of these bands is frequency shifted and provided with suf...

OBJECTIVE To determine the hearing levels of participants of a randomized group using a smartphone hearing application and to compare these results with the results from a pure-tone audiogram. MATERIALS AND METHODS A heterogenous group consisting of both normal-hearing and hearing-impaired participants were included in this study. Pure-tone audiogram thresholds were measured from 250 Hz to 80...

The behavioral audiograms of 2 fox squirrels (Sciurus niger) were determined with a conditioned avoidance procedure. The squirrels were able to hear tones ranging from 113 Hz to 49 kHz at a level of 60 dB sound-pressure level or less, with their best sensitivity of 1 dB occurring at 8 kHz. Their ability to hear frequencies below 150 Hz indicates that they have good low-frequency hearing, as do ...

Due to the opening of the Northwest Passage and interest in Arctic resources, naval activities (amongst others) and ocean noise are increasing in northerly beluga waters. Through data acquired in a capturerelease project, this work examines the frequencies and sound levels to which wild belugas are sensitive. A standard audiogram is being determined from the wild samples, noting the variation b...