Search Results
Results 151 - 200 of 1320
1 2 3 4 5 6 7 8 9 10 >
Puria Sunil S Department of Mechanical Engineering, 496 Lomita Mall, Stanford, CA 94305, USA. - - 2010
The development of the unique capacity for high-frequency hearing in many mammals was due in part to changes in the middle ear, such as the evolution of three distinct middle-ear bones and distinct radial and circumferential collagen fiber layers in the eardrum. Ossicular moment(s) of inertia (MOI) and principal rotational ...
S?sl? Ahmet Emre - - 2010
OBJECTIVE: To assess cochlear involvement and hearing loss in patients with Beh?et's disease (BD). METHOD: Forty-two patients with BD and 24 sex and age matched healthy subjects were included in the study. pure-tone audiometry including high frequencies (250-16000Hz) and DPOAE were performed to all participants. Results of the audiological evaluation ...
Nuku Pines - - 2010
Three experiments investigated the nature of visuo-auditory crossmodal cueing in a triadic setting: participants had to detect an auditory signal while observing another agent's head facing one of the two laterally positioned auditory sources. Experiment 1 showed that when the agent's eyes were open, sounds originating on the side of ...
Hwang Yaw-Huei - - 2009
As the use of leaded gasoline has ceased in the last decade, background lead exposure has generally been reduced. The aim of this study was to examine the effect of low-level lead exposure on human hearing loss. This study was conducted in a steel plant and 412 workers were recruited ...
Dasgupta A - - 2009
BACKGROUND AND OBJECTIVE: Noise is a major health threat in occupations where its level exceeds the permissible level (90dB). Most serious health effect is Noise Induced Hearing Loss (NIHL). Objective of the present study was to find out any relationship between occupational noise exposure and hearing impairment of the employees ...
Chou Yu-Fung - - 2009
Evidence has accumulated concerning the adverse effects of noise on hearing acuity, but it is not clear whether working shifts may decelerate the effects of hearing loss. The objective of this study is to assess the effects of shift work on hearing loss in a noisy work environment. A sample ...
Fernandes Kelly Cristina de Souza - - 2009
BACKGROUND: Many situations may raise difficulties when obtaining hearing thresholds for each ear separately. These situations demand the use of masking. The plateau method has been used for more than four decades. Nevertheless, in 2004 a different masking protocol was suggested, called the optimized method, to replace the plateau method ...
Strelcyk Olaf - - 2009
Derived-band click-evoked auditory brainstem responses (ABRs) were obtained for normal-hearing (NH) and sensorineurally hearing-impaired (HI) listeners. The latencies extracted from these responses, as a function of derived-band center frequency and click level, served as objective estimates of cochlear response times. For the same listeners, auditory-filter bandwidths at 2 kHz were ...
Sakaguchi Hirofumi - - 2009
Tip links are thought to be an essential element of the mechanoelectrical transduction (MET) apparatus in sensory hair cells of the inner ear. The molecules that form tip links have recently been identified, and the analysis of their properties has not only changed our view of MET but also suggests ...
Ho Allan Thiam Poh - - 2009
OBJECTIVE: The Otogram is an automated computer-assisted audiometer that allows patients to self-administer audiometry for their pure-tone audiogram. There has been no research published in a peer-reviewed journal, validating its use in an otology outpatient clinic. We therefore proposed to investigate and compare the inter-rater and intrarater accuracy and reliability ...
Aslan S - - 2010
OBJECTIVE: To investigate hearing loss in patients with Beh?et's disease. MATERIALS AND METHODS: Twenty-four consecutive cases of Beh?et's disease and 24 sex- and age-matched controls were included in this study. Pure tone and high frequency audiometric tests were performed and pure tone average hearing thresholds calculated for both groups. Transient ...
Manley Geoffrey A - - 2010
The traditional view that a tympanic middle ear developed only once, when vertebrates made the transition from fish in water to land-living animals, has been shown to be incorrect. Middle ears with a tympanum connected by one or more ossicles to the cochlea developed very much later in evolutionary history ...
Albera Roberto - - 2010
The aims of this study were to evaluate the influence of age and exposure to noise in determining the evolution of hearing loss after noise-induced hearing loss has been already established and to define the further evolution of presbycusis. This is a cross-sectional study based on the evaluation of pure-tone ...
Brown Christopher A - - 2010
Speech reception in noise is an especially difficult problem for listeners with hearing impairment as well as for users of cochlear implants (CIs). One likely cause of this is an inability to 'glimpse' a target talker in a fluctuating background, which has been linked to deficits in temporal fine-structure processing. ...
Kim Gibak - - 2009
Traditional noise-suppression algorithms have been shown to improve speech quality, but not speech intelligibility. Motivated by prior intelligibility studies of speech synthesized using the ideal binary mask, an algorithm is proposed that decomposes the input signal into time-frequency (T-F) units and makes binary decisions, based on a Bayesian classifier, as ...
Kuk Francis - - 2009
BACKGROUND: Frequency transposition has gained renewed interest in recent years. This type of processing takes sounds in the unaidable high-frequency region and moves them to the lower frequency region. One concern is that the transposed sounds mask or distort the original low-frequency sounds and lead to a poorer performance. On ...
Lauer Amanda M - - 2009
Normal-hearing (NH) listeners and hearing-impaired (HI) listeners detected and discriminated time-reversed harmonic complexes constructed of equal-amplitude harmonic components with fundamental frequencies (F0s) ranging from 50 to 800 Hz. Component starting phases were selected according to the positive and negative Schroeder-phase algorithms to produce within-period frequency sweeps with relatively flat temporal ...
Ribeiro Fl?via Martins - - 2010
Hearing thresholds were estimated in normal-hearing term and preterm neonates of <35 weeks of age using multiple-stimulus auditory steady-state responses (ASSRs). The tresholds, expressed in decibel sound pressure level, at signal frequencies of 500, 1000, 2000 and 4000 Hz were 44.30 +/- 9.88, 27.80 +/- 6.79, 26.77 +/- 6.09 and ...
Wid??n S E - - 2009
The purpose of the present study was to investigate possible associations between college students' attitudes, risk-taking behaviour related to noisy activities, and hearing problems such as threshold shifts or self-experienced hearing symptoms. The sample included 258 students aged between 17 and 21 enrolled at the University of Pennsylvania, USA. A ...
Lutman M E - - 2009
OBJECTIVES: To estimate the distribution of inter-aural sensorineural hearing threshold level differences in the non-noise-exposed adult population of the UK. SETTING: A two-stage population study carried out in 1979-1986, initially by postal questionnaire, followed up in a proportion of participants by clinical and audiological examination. PARTICIPANTS: Volunteers (n = 48 ...
Alaerts Jane - - 2009
This paper describes low-frequency auditory steady-state responses (ASSRs) to speech-weighted noise stimuli. The effect of modulation frequency was evaluated within the frequency range below 40 Hz. Furthermore, objective ASSR measures were related to speech understanding performance in normal-hearing and hearing-impaired listeners. The variability in ASSR recordings over independent test sessions ...
McNeill Celene - - 2009
This study aimed to assess the extent and implications of short-term hearing fluctuation in Meniere's disease. Thirty-six subjects diagnosed with Meniere's were recruited to measure their own hearing using in-situ audiometry via a hearing aid (Widex Diva) and a portable programmer (SP3). Self-hearing tests measuring up to 14 frequency bands ...
Ward Lawrence M - - 2009
We measured tinnitus loudness using a new method of psychophysical scaling with the aim of introducing a potentially useful new procedure to the literature. Fourteen adults reporting tinnitus were trained to use a standardized loudness scale, and then they used that response scale to assess loudness of nonstandard stimuli and ...
Lesage François-Xavier - - 2009
There is a lack of data about police officers' hearing thresholds and the risk of noise-induced hearing loss (NIHL) associated with this occupation. In France, 129,000 national police officers, 96,000 state police force members and 16000 municipal police officers may be affected by occupational noise exposure. To evaluate the association ...
Ratnayake S A B - - 2009
There have been several studies that have demonstrated a link between the hearing loss of subjects and tinnitus. However, there has been no systematic evaluation of the link between perceived tinnitus distress and an underlying hearing loss. The purpose of the current study is to explore this association, and ascertain ...
Kumar Ajith - - 2009
This study looked at output levels produced by new generation personal music systems (PMS), at the level of eardrum by placing the probe microphone in the ear canal. Further, the effect of these PMS on hearing was evaluated by comparing the distortion product otoacoustic emissions and high frequency pure tone ...
Marangoni Andréa Tortosa - - 2009
BACKGROUND: individuals with profound hearing loss may present vibrotactile responses when tested with supra-aural earphones due to the large skull area exposed to vibration in these transducers. AIM: to verify the influence of the type of transducer when assessing air conducted pure tone thresholds in individuals with profound sensorineural hearing ...
Wenzel Gentiana I - - 2009
The hearing performance with conventional hearing aids and cochlear implants is dramatically reduced in noisy environments and for sounds more complex than speech (e. g. music), partially due to the lack of localized sensorineural activation across different frequency regions with these devices. Laser light can be focused in a controlled ...
Van Dun Bram - - 2009
Auditory steady-state responses (ASSRs) are used for hearing threshold estimation at audiometric frequencies. Hearing impaired newborns, in particular, benefit from this technique as it allows for a more precise diagnosis than traditional techniques, and a hearing aid can be better fitted at an early age. However, measurement duration of current ...
Savel Sophie - - 2009
The number of subjects in studies on human spatial hearing is generally small. Therefore, individual differences and the factors underlying variability are unknown. In this study, we investigated across-listener variability in auditory localization abilities in a group of 50 naïve adults with normal hearing. Targets were trains of low-frequency noise ...
Michalewski Henry J - - 2009
Auditory temporal processes in quiet are impaired in auditory neuropathy (AN) similar to normal hearing subjects tested in noise. N100 latencies were measured from AN subjects at several tone intensities in quiet and noise for comparison with a group of normal hearing individuals. Subjects were tested with brief 100 ms ...
Champoux François - - 2009
OBJECTIVE: The aim of this study was to investigate whether a controlled unilateral reduction in auditory acuity at the higher audiometric frequencies would have an effect on the variability in responses obtained on a task designed to measure the precedence effect. DESIGN: The experiment was conducted with participants located in ...
Spitzer Stephanie - - 2009
Fundamental frequency (F0) variation is one of a number of acoustic cues normal hearing listeners use for guiding lexical segmentation of degraded speech. This study examined whether F0 contour facilitates lexical segmentation by listeners fitted with cochlear implants (CIs). Lexical boundary error patterns elicited under unaltered and flattened F0 conditions ...
Gnansia Dan - - 2009
This study assessed the effects of spectral smearing and temporal fine structure (TFS) degradation on masking release (MR) (the improvement in speech identification in amplitude-modulated compared to steady noise observed for normal-hearing listeners). Syllables and noise stimuli were processed using either a spectral-smearing algorithm or a tone-excited vocoder. The two ...
Ba┼čkent Deniz - - 2009
An interrupted signal may be perceptually restored and, as a result, perceived as continuous, when the interruptions are filled with loud noise bursts. Additionally, when the signal is speech, an improvement in intelligibility may be observed. The perceived continuity of interrupted tones is reduced when the signal level is ramped ...
Simpson Andrea - - 2009
Frequency-lowering technology has been around for decades. The primary aim--namely, that of providing high-frequency information to those with severe high-frequency hearing loss--addresses a clinical need most conventional hearing devices are still unable to provide. Early studies with frequency-lowering technology reported mostly unfavorable results, and the devices never gained clinical popularity. ...
Worthington Darrin A - - 2009
The potential risk to hearing that mass-storage personal listening devices (PLDs) pose remains unclear. Previous research in this area has either focused on maximum outputs of these devices or on ear-canal measurements of listening levels that could not be compared to standards of occupational noise exposure. The purpose of this ...
Schnupp Jan W H JW Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, UK. - - 2009
Although ears capable of detecting airborne sound have arisen repeatedly and independently in different species, most animals that are capable of hearing have a pair of ears. We review the advantages that arise from having two ears and discuss recent research on the similarities and differences in the binaural processing ...
Moffat G - - 2009
Restoration of auditory input through the use of hearing aids has been proposed as a potentially important means of altering tinnitus among those tinnitus sufferers who experience significant sensorineural hearing loss. In animal models of neural plasticity induced by noise trauma, high-frequency stimulation in deafferented regions of the auditory spectrum ...
Boger Marlene Escher - - 2009
Noise Induced Hearing Loss (NIHL) is an insidious and cumulative disease that worsens over the years with work-related noise exposure. AIM: To evaluate the noise spectrum influence on NIHL prevalence in workers. MATERIALS AND METHODS: This a cross-sectional historical cohort carried out in steel mills, lumber mills and marble shops, ...
Strelcyk Olaf - - 2009
Frequency selectivity, temporal fine-structure (TFS) processing, and speech reception were assessed for six normal-hearing (NH) listeners, ten sensorineurally hearing-impaired (HI) listeners with similar high-frequency losses, and two listeners with an obscure dysfunction (OD). TFS processing was investigated at low frequencies in regions of normal hearing, through measurements of binaural masked ...
D'haenens Wendy - - 2009
OBJECTIVES: To determine the ability of the air-conduction multiple-frequency auditory steady-state response (ASSR) technique to diagnose normal hearing (NH) and mild and moderate degrees of sensorineural hearing loss (SNHL), to assess patients with conductive hearing loss (CHL), to evaluate flat and sloping configurations of hearing impairment, and to provide sensitivity ...
Poulsen Torben T Department of Electrical Engineering, Technical University of Denmark, Lyngby, Denmark. - - 2009
Hearing threshold sound pressure levels were measured for the Sennheiser HDA 280 audiometric earphone. Hearing thresholds were measured for 25 normal-hearing test subjects at the 11 audiometric test frequencies from 125 Hz to 8000 Hz. Sennheiser HDA 280 is a supra-aural earphone that may be seen as a substitute for ...
Ter Haar G - - 2009
BACKGROUND: Age-related hearing loss (ARHL) is the most common form of hearing loss in humans and is increasingly recognized in dogs. HYPOTHESIS: Cochlear lesions in dogs with ARHL are similar to those in humans and the severity of the histological changes is reflected in tone audiograms. ANIMALS: Ten geriatric dogs ...
Braun Christopher B - - 2009
Enhanced hearing, the ability to detect minute fluctuations in ambient pressure, has evolved independently or nearly so within every major group of vertebrates. Within Teleost fishes, enhanced hearing has evolved perhaps as many as 20 times. Within one subset of cichlid fishes, the Malagasy and south Asian Etroplinae + Ptychochrominae, ...
Summers Van - - 2009
Reduced ability to make use of temporal fine structure (TFS) information may contribute to deficits among hearing impaired (HI) listeners for speech recognition in competing background sounds. The broad tuning typically observed in HI listeners will produce more complex patterns of TFS as input to the auditory nerve, and these ...
Goldstein Julius L - - 2009
Mean psychophysical data on most comfortable and uncomfortable tone levels as a function of hearing loss [Pascoe, 13th Danavox Symp. 153-183 (1988); D. M. Schwartz et al., The Hearing J. 41, 13-17 (1988)] is interpolated for other loudness levels by representing impaired auditory response as a modification of the idealized ...
Potier Morgan - - 2009
OBJECTIVES: Here, we evaluate the risks of amplified music for disc-jockeys (DJs) working in nightclubs. DESIGN: Sound level measurements were performed within the DJ mixing booths. A questionnaire was used to obtain exposure to noise and length of time in the profession. Audiograms and tinnitus pitch matching was also performed. ...
Prates Letícia Pimenta Costa Spyer LP do Hospital das Clínicas - Universidade Federal Minas Gerais. - - 2009
frequency compression. to evaluate the index of speech recognition (IPRF) using frequency compression in three different ratios. monosyllabic words were recorded using an algorithm of frequency compression in three ratios: 1:1, 2:1, 3:1, generating three lists of words. Eighteen listeners accomplished the IPRF using the modified words. They were subdivided ...
Brown Christopher A - - 2009
Electric-acoustic stimulation (EAS) occurs when a cochlear implant recipient receives some amount of acoustic stimulation, typically as a consequence of residual low-frequency hearing. This combined stimulation often leads to significant improvements in speech intelligibility, especially in the presence of a competing background. We have demonstrated EAS benefit when target speech ...
1 2 3 4 5 6 7 8 9 10 >