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Effects of noise on mental performance with regard to subjective noise sensitivity
Authors:Goran Belojevi?  Evy Öhrström  Ragnar Rylander
Institution:(1) Institute of Hygiene and Medical Ecology, Medical Faculty, University of Belgrade, Pasterova 2, 11000 Belgrade, Yugoslavia;(2) Department of Environmental Medicine, University of Gothenburg, Sweden
Abstract:Summary Objective and subjective effects of moderate levels of recorded traffic noise Leq = 55 dB(A) and 75 dB(A)] on mental performance were studied in a laboratory setting. A total of 45 subjects (23 males and 22 females) were investigated with respect to subjective noise sensitivity (SNS). Four cognitive tasks were applied involving different psychological functions: Short-Term Memory (STM), Search and Memory 5 (SAM 5) (vigilance), Hidden Figures (HF) (spatial reasoning) and Mental Arithmetic (MA) (parallel processing). Three groups of 15 subjects were defined according to their scores on Weinstein's Noise Sensitivity Scale as tolerant, moderately sensitive or highly sensitive to noise. A similar level of performance was observed in the three groups under quiet conditions 30 dB(A) Leq], but under noisy conditions significant differences (P<0.05) were seen between them on the STM (words) and MA (total results) tasks, and the lowest performance accuracy was demonstrated by the noise-sensitive subjects. SNS was the primary factor responsible for these differences. There were no significant differences between the groups in respect of the SAM 5 and HF tasks, under either quiet or noisy conditions. Annoyance while performing tasks under noisy conditions was regularly and significantly higher among subjects judged to be noise sensitive on Weinstein's scale, as compared with those judged to have low or moderate SNS.
Keywords:Noise  Performance  Noise sensitivity  Annoyance
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