Low-frequency infrasound (below 20 Hz) can raise cortisol levels in saliva and increase irritability.
Study: Infrasound likely a key factor in alleged hauntings
Low-frequency infrasound (below 20 Hz) can raise cortisol levels in saliva and increase irritability.
Science & Tech
Editorial note: This article represents original analysis and commentary by the TechDailyPulse editorial team.