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The Journal of the Acoustical Society... Jan 1988An intermittent monaural tone may induce a decline in the loudness of a continuous tone presented to the same ear [Canévet et al., Br. J. Audiol. 17, 49-57 (1983)]. Two...
An intermittent monaural tone may induce a decline in the loudness of a continuous tone presented to the same ear [Canévet et al., Br. J. Audiol. 17, 49-57 (1983)]. Two experiments studied the frequency selectivity of loudness adaptation induced in this manner. The method of successive magnitude estimations was used to measure the loudness of a monaural 84-s test tone before and after a single presentation of a 24-s inducer tone in the same ear. The first experiment shows that, for an inducing tone (500, 1000, or 3000 Hz) approximately 15 dB more intense than a test tone set to one of 21 different frequencies, adaptation is greatest when the two tones have the same frequency; with increasing difference between the test-tone and inducer frequencies, adaptation progressively declines. The second experiment measured frequency selectivity in the loudness reduction caused by a 1000-Hz inducer as a function of its level. As inducer level went from 75 to 95 dB (with test tone constant at 60 phons), selectivity passes progressively from the type seen in short-term or low-level fatigue (maximal for the 1000-Hz test tone) to a type seen in long-term or high-level fatigue (maximal for the 1000-Hz test tone) to a type seen in long-term or high-level fatigue (maximal at frequencies higher than that of the inducer or fatiguing tone). A common cochlear origin and a continuity between the mechanisms of ipsilaterally induced adaptation and high-level fatigue are suggested by the data.
Topics: Adaptation, Physiological; Adult; Auditory Fatigue; Humans; Loudness Perception
PubMed: 3343438
DOI: 10.1121/1.396443 -
Indian Journal of Otolaryngology Sep 1962
Topics: Auditory Fatigue; Hearing; Hearing Loss, Noise-Induced; Hearing Tests; Humans
PubMed: 13967990
DOI: 10.1007/BF03047296 -
Audiology : Official Organ of the... 1994Exposure limits to noise in the workplace have been set merely to prevent disabling hearing loss. Consequently, even in workplaces where a limit of 85 dBA-8 h is... (Review)
Review
Exposure limits to noise in the workplace have been set merely to prevent disabling hearing loss. Consequently, even in workplaces where a limit of 85 dBA-8 h is strictly enforced, the sound environment is very poorly matched to human auditory capabilities. In fact, ergonomists have been led to characterize this feature of the industrial work environment as an 'extreme condition' that is being imposed on a major segment of the workforce. This type of sound environment seriously restricts the possibilities of making use of auditory temporal, spatial, and frequency resolution, and often reduces the latter by damaging the inner ear. Sound warning signals are often too loud or too weak. The temporal features of such signals are frequently distorted by strong reverberation in the local itself. Spatial separation of sound sources is strongly limited by the masking effect of the background noise. The depth of the perceived sound field is generally reduced to very great degree. Workers experience isolation because verbal communication is severely restricted. Most discernable acoustic occurrences are devoid of meaning or are experienced as annoying or irritating. Noise has been reported as the most frequently mentioned factor of annoyance in industrial workplaces. Such environments are far from being matched to human capabilities and are scarcely conducive to work satisfaction. A general remedial framework for making the appropriate improvements is thereby proposed.
Topics: Attention; Auditory Fatigue; Auditory Perception; Hearing Loss, Noise-Induced; Humans; Maximum Allowable Concentration; Noise, Occupational; Occupational Diseases; Perceptual Masking; Pitch Discrimination; Sound Localization; Speech Perception
PubMed: 8129676
DOI: 10.3109/00206099409072950 -
The Journal of the Acoustical Society... Jul 1991The interaction of noise exposure with other variables is reviewed. For the case of the interaction of noise with other variables that produce behavioral threshold... (Review)
Review
The interaction of noise exposure with other variables is reviewed. For the case of the interaction of noise with other variables that produce behavioral threshold shifts, the application of a newly developed model is described and demonstrated. This model, referred to as the modified power-law model, provides an accurate prediction of the combined effects of two threshold-elevating factors. The model accounts for the interaction of post-exposure a pre-existing pre-existing permanent loss or a pre-existing temporary loss. The model's application is demonstrated for multiple exposures to steady-state noise in which each exposure lasts as short as 12 min or as long as 6 h. Finally, implications of the model's application to the interaction long as 6 h. Finally, implications of the model's application to the interaction of noise with other ototraumatic agents are reviewed.
Topics: Auditory Fatigue; Hair Cells, Auditory; Hearing Loss, Noise-Induced; Humans; Loudness Perception; Noise; Noise, Occupational; Occupational Diseases; Risk Factors; Sound Spectrography
PubMed: 1880287
DOI: 10.1121/1.401286 -
The Journal of the Acoustical Society... Jul 1991Peak pressure has been one of the key parameters of impulse noise used to assess the hazard to hearing. It is used in most international noise exposure limits. France... (Review)
Review
Peak pressure has been one of the key parameters of impulse noise used to assess the hazard to hearing. It is used in most international noise exposure limits. France uses an A-weighted energy limit. There is a rough correspondence between peak pressure and the hazard to hearing for a given type of impulse noise. However, when the effects of different types of impulses are compared, this correspondence breaks down. One of the alternate measures of impulse intensity is weighted energy. Weighted energy is appealing for a number of reasons. It does not depend on details of the pressure-time history such as the peak pressure and the more common duration measures. It should be easier to integrate with continuous or intermittent noise standards. It would make it easier to use standard hearing protector attenuation to estimate the hazard when a specific hearing protector is worn. Results of previously published articles and reports will be discussed. These reports lead to the conclusion that weighted energy is a more potent determiner of hearing hazard than peak pressure if spectral effects are controlled.
Topics: Animals; Auditory Fatigue; Cochlea; Hearing Loss, Noise-Induced; Humans; Loudness Perception; Noise; Pitch Perception; Risk Factors; Sound Spectrography
PubMed: 1880290
DOI: 10.1121/1.401289 -
American Journal of Audiology Dec 2008Eight lines of evidence implicating the dorsal cochlear nucleus (DCN) as a tinnitus contributing site are reviewed. We now expand the presentation of this model,... (Review)
Review
PURPOSE
Eight lines of evidence implicating the dorsal cochlear nucleus (DCN) as a tinnitus contributing site are reviewed. We now expand the presentation of this model, elaborate on its essential details, and provide answers to commonly asked questions regarding its validity.
CONCLUSIONS
Over the past decade, numerous studies have converged to support the hypothesis that the DCN may be an important brain center in the generation and modulation of tinnitus. Although other auditory centers have been similarly implicated, the DCN deserves special emphasis because, as a primary acoustic nucleus, it occupies a potentially pivotal position in the hierarchy of functional processes leading to the emergence of tinnitus percepts. Moreover, because a great deal is known about the underlying cellular categories and the details of synaptic circuitry within the DCN, this brain center offers a potentially powerful model for probing mechanisms underlying tinnitus.
Topics: Animals; Auditory Fatigue; Auditory Pathways; Cochlear Nucleus; Electric Stimulation; Hair Cells, Auditory; Hair Cells, Auditory, Outer; Humans; Nerve Net; Neuronal Plasticity; Noise; Psychoacoustics; Sound Spectrography; Tinnitus
PubMed: 18978198
DOI: 10.1044/1059-0889(2008/08-0004) -
International Journal of Audiology Aug 2016To validate self-reported hearing-related symptoms among personnel exposed to moderately high occupational noise levels at an obstetrics clinic.
OBJECTIVE
To validate self-reported hearing-related symptoms among personnel exposed to moderately high occupational noise levels at an obstetrics clinic.
DESIGN
Sensitivity, specificity, and predictive values were calculated for questionnaire items assessing hearing loss, tinnitus, sound sensitivity, poor hearing, difficulty perceiving speech, and sound-induced auditory fatigue. Hearing disorder was diagnosed by pure-tone audiometry, distortion product otoacoustic emissions, and HINT (Hearing In Noise Test).
STUDY SAMPLE
Fifty-five female obstetrics personnel aged 22-63 participated; including 26 subjects reporting hearing loss, poor hearing, tinnitus, or sound sensitivity, and 29 randomly selected subjects who did not report these symptoms.
RESULTS
The questionnaire item assessing sound-induced auditory fatigue had the best combination of sensitivity ≥85% (95% CIs 56 to 100%) and specificity ≥70% (95% CIs 55 to 84%) for hearing disorder diagnosed by audiometry or otoacoustic emission. Of those reporting sound-induced auditory fatigue 71% were predicted to have disorder diagnosed by otoacoustic emission. Participants reporting any hearing-related symptom had slightly worse measured hearing.
CONCLUSIONS
We suggest including sound-induced auditory fatigue in questionnaires for identification of hearing disorder among healthcare personnel, though larger studies are warranted for precise estimates of diagnostic performance. Also, more specific and accurate hearing tests are needed to diagnose mild hearing disorder.
Topics: Adult; Audiometry, Pure-Tone; Audiometry, Speech; Auditory Fatigue; Diagnostic Self Evaluation; Female; Hearing; Hearing Loss; Humans; Middle Aged; Otoacoustic Emissions, Spontaneous; Reproducibility of Results; Sensitivity and Specificity; Sound; Surveys and Questionnaires; Young Adult
PubMed: 27195802
DOI: 10.1080/14992027.2016.1177210 -
[Report]. Civil Aeromedical Research... Jan 1965
Topics: Auditory Fatigue; Fatigue; Hearing; Hearing Tests; Humans; Psychophysiology; Thinking
PubMed: 14295227
DOI: No ID Found -
The Journal of the Acoustical Society... Apr 1985Selective adaption and anchoring effects in speech perception have generated several different hypotheses regarding the nature of contextual contrast, including...
Selective adaption and anchoring effects in speech perception have generated several different hypotheses regarding the nature of contextual contrast, including auditory/phonetic feature detector fatigue, response bias, and auditory contrast. In the present study three different seven-step [hId]-[h epsilon d] continua were constructed to represent a low F0 (long vocal tract source), a high F0 (long vocal tract source), and a high F0 (short vocal tract source), respectively. Subjects identified the tokens from each of the stimulus continua under two conditions: an equiprobable control and an anchoring condition which included an endpoint stimulus from one of the three continua occurring at least three times more often than any other single stimulus. Differential contrast effects were found depending on whether the anchor differed from the test stimuli in terms of F0, absolute formant frequencies, or both. Results were inconsistent with both the feature detector fatigue and response bias hypothesis. Rather, the obtained data suggest that vowel contrast occurs on the basis of normalized formant values, thus supporting a version of the auditory-contrast theory.
Topics: Auditory Fatigue; Female; Humans; Male; Phonetics; Speech Perception
PubMed: 3989110
DOI: 10.1121/1.391998 -
Audiology : Official Organ of the... 1984Absolute thresholds at 4 and 6 kHz were tested in three sessions before and after 20 min of exposure to 105 dB(A) pink noise in 12 young normal-cycling females, 11 young...
Absolute thresholds at 4 and 6 kHz were tested in three sessions before and after 20 min of exposure to 105 dB(A) pink noise in 12 young normal-cycling females, 11 young females on oral contraceptives and 8 young men. Women on contraceptives showed lower resting thresholds, larger temporary threshold shift (TTS) and higher recovery rates than normal-cycling females. The analysis of resting thresholds, auditory fatigue and recovery from auditory fatigue did not evidence any sex-linked difference. Significant differences linked to the phases of the menstrual cycle and of the contraceptive cycle were observed during recovery from auditory fatigue at 4 kHz and in resting thresholds at 6 kHz. Application of Kendall's coefficient of concordance confirmed these results. Absolute thresholds were highest at menstruation and lowest in the postovulatory phase in normal-cycling females and in women on oral contraceptives, during the days of pill ingestion. Oral contraception is probably a more important factor of change in hearing performance than the phases of the menstrual cycle.
Topics: Adult; Auditory Fatigue; Auditory Perception; Auditory Threshold; Contraceptives, Oral; Female; Humans; Male; Menstruation; Sex Factors
PubMed: 6517750
DOI: 10.3109/00206098409081540