Infrasound is sound below 20 Hz, lower than humans can perceive. But just because we don’t consciously hear it, that doesn’t mean we don’t respond to it; in certain individuals, low-frequency sound can induce feelings of fear or dread or even depression. They may even be responsible for some ghost sightings, but we’ll get to …
Image: Flickr/Nils Rinaldi via CC by 2.0
Infrasound: The Fear Frequency
