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[Effect of noise on human mental performance]
1Department of Aerospace Medicine, The Fourth Military Medical University, Xi'an, China.
Summary
Moderate noise levels, specifically 85-90 dB(A), impaired cognitive performance on complex tasks like subtraction and symbol-digit substitution. Performance decrements were more pronounced in introverted individuals.
Area of Science:
- Cognitive Psychology
- Environmental Psychology
- Human Factors Engineering
Background:
- Noise pollution is a pervasive environmental stressor.
- Understanding the impact of moderate noise on cognitive functions is crucial for occupational and daily life settings.
Purpose of the Study:
- To assess the effects of moderate noise exposure (85-90 dB(A)) on human cognitive performance.
- To investigate potential moderating effects of personality traits on noise-induced cognitive decrements.
Main Methods:
- Twenty-four healthy young males were exposed to 85 and 90 dB(A) noise for 2 hours.
- Cognitive tasks included successive calculation, successive subtraction, and determining figures according to symbols.
- Participants were assessed based on accuracy, reaction time, and overall performance.
Main Results:
- Noise at 85 dB(A) for 1 hour significantly reduced performance in successive subtraction.
- Exposure to 90 dB(A) for 30-120 minutes significantly prolonged reaction time in the symbol-digit test.
- Extroverts demonstrated superior performance compared to introverts in the symbol-digit test under 90 dB(A) noise.
Conclusions:
- Moderate noise negatively impacts cognitive performance, particularly on tasks with higher cognitive load.
- Individual personality traits, such as extroversion/introversion, influence susceptibility to noise-induced cognitive impairment.