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Effects of infrasound on cognitive performance
Aviation, Space, and Environmental Medicine
|April 1, 1978
Summary
This study found that exposure to infrasound and noise did not impair cognitive performance in subjects. Researchers concluded that the adverse effects of infrasound, particularly from sources like jet aircraft, are likely exaggerated.
Area of Science:
- Audiology
- Environmental Health
- Cognitive Psychology
Background:
- Previous literature suggested potential adverse effects of infrasound on human cognition and well-being.
- Concerns exist regarding infrasound exposure from sources such as modern jet aircraft.
Purpose of the Study:
- To investigate the impact of infrasound and noise exposure on cognitive performance.
- To assess subjective reports of discomfort during infrasound exposure.
Main Methods:
- Three experiments were conducted involving 40 subjects exposed to varying levels of infrasound (7 Hz tone) and ambient/background noise.
- Cognitive tasks included Serial Search Task and Complex Counting Task.
- Exposure durations varied from 15 to 30 minutes at sound pressure levels up to 142 dB.
Main Results:
- No significant decrements in cognitive performance were observed across all experimental conditions.
- Subjects did not report dizziness or disorientation, contrary to some prior research.
- Infrasound exposure at tested levels did not negatively affect cognitive function.
Conclusions:
- The study suggests that the adverse effects of infrasound have been overstated.
- Current levels of infrasound from modern jet aircraft are unlikely to pose a practical problem for cognitive performance.
- Further research may be warranted, but current evidence indicates low risk.