" Instead of infrasound tricking the mind, I think it’s possible for infrasound to make the spirit that is already there visible. I think it’s possible that the presence of infrasound did not create a false apparition, but actually made it possible for one to be seen. I think there are spirits that can only be seen, heard, or felt under certain atmospheric conditions, and the presence of infrasound is one of those conditions. Just like infrared light can illuminate a spirit in the dark and give us a way to see something we normally would not, so can infrasound. "

― Zak Bagans , Dark World: Into the Shadows with the Lead Investigator of The Ghost Adventures Crew