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Study: Infrasound likely a key factor in alleged hauntings
Low-frequency infrasound (below 20 Hz) can raise cortisol levels in saliva and increase irritability.
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theguardian.com
Spooky feelings in old houses may be caused by boiler sounds, study suggests
Inaudible infrasound from old pipes and ventilation systems may affect how people feel, research indicates
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arstechnica.com
Study: Infrasound likely a key factor in alleged hauntings
Low-frequency infrasound (below 20 Hz) can raise cortisol levels in saliva and increase irritability.