A small study found that individuals experienced negative affect and higher salivary cortisol when exposed to infrasound (18 Hz).

Summary: https://scitechdaily.com/that-haunted-feeling-may-be-caused-by-a-sound-you-cant-hear/

Original paper: https://www.frontiersin.org/journals/behavioral-neuroscience/articles/10.3389/fnbeh.2026.1729876/full

Infrasound has been hypothesized to be responsible for the Dyatlov Pass incident: https://www.chroniclebooks.com/products/dead-mountain-paperback

#Science #Infrasound #Stress