sixpenceee:

Infrared sound is a sound that we can’t hear but our ears can detect. Between 7Hz and 19Hz it can install the sense of being watched, dread, fear and panic. At 19Hz the sounds can vibrate with your eyeball, messing with your visions and causing you to think you can see figures in your peripheral vision.

Old houses and buildings have thick walls and messed up pipes which can emit infrared sounds. This is how haunted houses can come to be. 

The problem is not everyone is sensitive to this type of sound. Do you want to figure out if you are sensitive to this “ghostly noise”?

Well you can, because when tigers roar they emit infrared sound. Go on this website and scroll to the paragraph on roars and click on the speaker icon. 

http://www.acoustics.org/press/145th/Walsh2.htm

If you feel scared then you’re probably sensitive to it.