Hazard of intermittent noise exposures

1974 ◽  
Vol 56 (S1) ◽  
pp. S60-S60
Author(s):  
W. D. Ward
Keyword(s):  
Intermittent Noise

The Effects of Adverse Environmental Conditions on Workload

1975 ◽  
Vol 19 (3) ◽  
pp. 301-304
Author(s):  
Ann E. Martin
Keyword(s):  
Environmental Conditions ◽  
Environmental Variables ◽  
Secondary Task ◽  
The Other ◽  
Random Numbers ◽  
Performance Decrement ◽  
Experimental Conditions ◽  
Continuous Noise ◽  
Adverse Environmental Conditions ◽  
Intermittent Noise

The present study was conducted to investigate the effects of environmental conditions on visual workload. The environmental variables used were temperature, studied at levels of 45°F., WBGT, and 95°F., WBGT; and noise, studied at 83 dBA intermittent noise and 93 dBA continuous noise. Workload was defined as the amount of attention demanded from an operator as measured by performance decrement on a secondary task while performing a primary and secondary task simultaneously. The secondary task was reading random numbers, and the primary task was reading word lists. Significant differences (p<.05) were found between the control condition and all experimental conditions. The low temperature and high temperature-continuous noise conditions were significantly different from the other conditions. Noise and temperature were found to significantly increase workload (p<05).

Effects of Intermittent Noise on the Performance of a Complex Psychomotor Task

1971 ◽  
Vol 13 (1) ◽  
pp. 59-63 ◽  
Author(s):  
A. John Eschenbrenner
Keyword(s):  
White Noise ◽  
Motion Compensation ◽  
Temporal Pattern ◽  
Detrimental Effect ◽  
Image Motion ◽  
Intensity Level ◽  
Noise Performance ◽  
Intermittent Noise ◽  
Time Image

Manual image-motion compensation, a complex psychomotor task involved in certain photographic activities from orbit, was investigated as a function of the temporal pattern (aperiodic, periodic, or continuous) and intensity level (50, 70, or 90 db.) of white noise. Performance was measured in terms of the total amount of time image motion was held at or below a 40-microradians/second criterion for specific blocks of trials. The results of the investigation showed that white noise had a detrimental effect on image motion compensation performance, and that the magnitude of the decrement varied as a function of both the temporal pattern and intensity level of this noise.

Cardiovascular responses to intermittent noise in type a and b female subjects

1988 ◽  
Vol 6 (2) ◽  
pp. 111-123 ◽  
Author(s):  
Jean C. Petiot ◽  
Jean Parrot ◽  
Jean P. Lobreau ◽  
Henri J. Smolik
Keyword(s):  
Cardiovascular Responses ◽  
Type A ◽  
Intermittent Noise ◽  
Female Subjects

Hazardous Decibels

AAOHN Journal ◽  
2007 ◽  
Vol 55 (8) ◽  
pp. 313-319 ◽  
Author(s):  
OiSaeng Hong ◽  
Daniel G. Samo
Keyword(s):  
United States ◽  
Hearing Loss ◽  
Noise Exposure ◽  
The United States ◽  
Protective Equipment ◽  
Noise Induced Hearing Loss ◽  
Occupational Noise ◽  
Engineering Controls ◽  
Occupational Noise Exposure ◽  
Intermittent Noise

Noise-induced hearing loss ranks among the most significant occupational health problems. In the united states, more than 1 million firefighters are at risk for noise-induced hearing loss due to exposure to hazardous levels of intermittent noise from sirens, air horns, and engines of emergency vehicles and fire trucks. Although irreversible, noise-induced hearing loss is entirely preventable through both engineering controls and personal protective equipment. This article describes occupational noise exposure, hearing loss, and strategies to prevent noise-induced hearing loss among firefighters.

The Effects of Environmental Change on Chicks’ Responses to a Familiar Stimulus

1983 ◽  
Vol 35 (4b) ◽  
pp. 291-297 ◽  
Author(s):  
Ann Taylor ◽  
Julia C. Berryman ◽  
D. J. H. Burgess ◽  
D. Hill ◽  
D. Mann
Keyword(s):  
Environmental Change ◽  
Familiar Stimulus ◽  
Testing Conditions ◽  
Intermittent Noise

The purpose of the present experiments was to explore chicks’ proximity seeking behaviour in relation to imprinting objects in unfamiliar settings. Experiment I showed that chicks, which were individually imprinted on a stationary imprinting object, displayed reduced proximity seeking behaviour when tested in a pen smaller than the rearing pen. This finding confirmed earlier work on the effects of changed pen size. Experiment II used continuous and intermittent noise rearing and testing conditions, in all possible combinations, and a stationary imprinting object. Increased proximity seeking was found in conditions where the auditory environment was changed from rearing to testing, a result apparently opposite to that obtained in earlier work. It is suggested that the effect of environmental change on proximity seeking may vary with the modality in which change occurs and the salience of the imprinting object.

Cochlear damage caused by continuous and intermittent noise exposure

2003 ◽  
Vol 178 (1-2) ◽  
pp. 70-78 ◽  
Author(s):  
Akram Pourbakht ◽  
Tatsuya Yamasoba
Keyword(s):  
Noise Exposure ◽  
Cochlear Damage ◽  
Intermittent Noise

Target-Detection Performance as a Function of Noise Intensity and Task Difficulty

1973 ◽  
Vol 36 (2) ◽  
pp. 439-442 ◽  
Author(s):  
Harold D. Warner ◽  
Norman W. Heimstra
Keyword(s):  
White Noise ◽  
Target Detection ◽  
Response Latency ◽  
Task Difficulty ◽  
Noise Intensity ◽  
Detection Performance ◽  
Intermittent Noise ◽  
Measures Of Performance ◽  
And Task

The purpose of the present investigation was to determine the effects of intermittent white noise with a 30% on-off ratio on target-detection performance under 4 levels of noise intensity and 3 levels of task difficulty. The 2 measures of performance were response latency and detection errors. The results showed that intensity interacts with task difficulty to determine the effect of intermittent noise on target-detection performance with both performance facilitation and decrement obtained.

Hearing impairment among workers occupationally exposed to excessive levels of noise

Open Medicine ◽  
2007 ◽  
Vol 2 (3) ◽  
pp. 313-318 ◽  
Author(s):  
Pavlina Gidikova ◽  
Gospodinka Prakova ◽  
Petar Ruev ◽  
Gergana Sandeva
Keyword(s):  
Hearing Loss ◽  
Hearing Impairment ◽  
Otoacoustic Emissions ◽  
Gradual Increase ◽  
Pure Tone Audiometry ◽  
Noise Levels ◽  
Distortion Products ◽  
Occupationally Exposed ◽  
Intermittent Noise ◽  
Excessive Noise

AbstractPure tone audiometry screening and ear examinations were conducted among 138 males working as machine and equipment operators occupationally exposed to intermittent noise of 85 to 105 dBA. Hearing loss up to 30 dB (preserved socially adequate hearing) was found in 25 workers. The hearing impairment was confirmed by distortion products of otoacoustic emissions measurements. A sharp increase in the frequency of cases can be found among the workers with service length over 10 years. While the frequency of the cases among workers with service length below 10 years is 5.45%, it is 26.5% among the subjects with service length over 10 years, with a gradual increase as a result of the increase in exposure duration. A positive correlation (p < 0.05) was found between the frequency of hearing impairment among the workers and the years of exposure to excessive noise levels. Some measures for preventing occupational noise-induced hearing loss were suggested.

Temporary threshold shifts produced by 24‐h exposures to intermittent noise

1979 ◽  
Vol 65 (S1) ◽  
pp. S117-S117
Author(s):  
J. H. Mills ◽  
R. M. Gilbert ◽  
W. Y. Adkins ◽  
L. Kulish
Keyword(s):  
Intermittent Noise
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