OBJECTIVES This study aimed (1) to investigate music theory teachers' professional and extra-professional vocal loading and background noise exposure, (2) to determine the correlation between vocal loading and background noise, and (3) to determine the correlation between vocal loading and self-evaluation data. METHODS Using voice dosimetry, 13 music theory teachers were monitored for one wor...

Bobbin and M. H. Thompson, Ann. Otol. Rhinol. Laryngol. 87, 185 (1978). 13. Glutamate and aspartate determinations performed by the enzymatic method of L. T. Graham and M. H. Aprison [Anal. Biochem. 15, 487 (1966)] yielded no evidence of an increase in the concentrations of these substances in perilymph collected during acoustic stimulation as compared with perilymph collected in silence. If AN...

The negative effects of loud anthropic sounds on non-human health and welfare urges attention. We report here the results a technical study we conducted attending Public Prosecutor’s request at Ribeirão Preto, SP, Brazil. A Civil Inquiry informed against nocive human concentration captive free-living animals around municipal zoo. zoo is part natural protected area that paradoxically was used as...

1. FM-FM neurons in the auditory cortex of the mustached bat are sensitive to a pair of frequency-modulated (FM) sounds that simulates an FM component of the orientation sound and an FM component of the echo. These neurons are tuned to particular delays between the two FM components, suggesting an encoding of target range information. The response properties of these FM-FM neurons, however, hav...

• Signal to noise ratio alone cannot represent speech quality. Speech quality perception is different in acoustic and electrical hearing. Cochlear implant users prefer softer conversational level sound. Normal hearing listeners higher are less sensitive distorted speech. Electrical by cochlear implants (CIs) may be fundamentally from the normal-hearing (NH) listeners, presumably showing unequal...

Background: Ototoxic chemicals can impair the sense of hearing and balance. In the past decades, the ototoxicity of solvents and their interaction with noise have become evident. This study has been carried out in the shoe manufacturing factory in Tehran (Iran) with the aim of evaluating the combined effects of noise and toluene on the workers' hearing. Materials and Methods: This cross-sect...

OBJECTIVE Interaural level difference (ILD) is the difference in sound pressure level (SPL) between the two ears and is one of the key physical cues used by the auditory system in sound localization. Our current understanding of ILD encoding has come primarily from invasive studies of individual structures, which have implicated subcortical structures such as the cochlear nucleus (CN), superior...

Potential responses of marine mammals to anthropogenic underwater sound are usually assessed by researchers and regulators on the basis of exposure to a single, relatively loud sound source. However, marine mammals typically receive sounds from multiple, dynamic sources. We developed a method to aggregate modeled sounds from multiple sources and estimate the sound levels received by individuals...

We used a pair of hydrophones to monitor sound pressure levels (SPL, dB re 1 μPa) and frequency spectra of ambient sounds in Haro Strait during 18 months (April 2004 November 2005). Half-hour average SPL in the broad frequency band 0.1-15 kHz ranges from minimum (background) levels of 95 dB to maximum levels of 130 dB. The average SPL over 17 months is 115 dB. The broadband sound field is domin...

Introduction Most implantable hearing aids currently available were developed to compensate the sensorineural hearing loss by driving middle ear structures (e.g., the ossicles). These devices are successfully used in round window (RW) stimulation clinically, although this was initially not the intended use. Here, a novel microactuator, specifically designed for RW stimulation, was tested in hum...