What he had discovered, aside from an awesome new way to torture interns, was infrasound. It's noise at a low enough frequency that you don't consciously hear it, but your ears still sense it. The process of receiving sensory input without your conscious mind understanding where it's coming from wreaks havoc with your emotions. Specifically, researchers found that sounds between 7 and 19 Hz it could induce fear, dread or panic.Infrasound linked to spooky effects
Knowing this is an article about ghosts, you can already see where this is going.
Their unusual experiences included feeling uneasy or sorrowful, getting chills down the spine or nervous feelings of revulsion or fear.Infrasound
“These results suggest that low frequency sound can cause people to have unusual experiences even though they cannot consciously detect infrasound,” said Wiseman, who presented his findings to the British Association science conference.
In 1998, Vic Tandy, experimental officer and part-time lecturer in the school of international studies and law at Coventry University, and Dr. Tony Lawrence of the psychology department wrote a paper called "Ghosts in the Machine" for the Journal of the Society for Psychical Research.(PDF) They cited infrasound as the cause of apparitions seen by staff at a so-called haunted laboratory in Warwick.Neil DeGrasse Tyson and Eugene Mirman on StarTalk, about Vic Tandy and infrasound. The Southwest Ghost Hunters Association carried out their own experiment. Vladimir Gavreau is considered the 'father of infrasound, as detailed in the article The Sonic Weapon Of Vladimir Gavreau, from The Journal of Borderland Research. Vic Tandy published again in Something In The Cellar, and his research into infrasound continued at Mary King's Ghost Fest in Edinburgh.
Several years earlier, Tandy was working late in the "haunted" Warwick laboratory when he saw a gray thing coming for him. "I felt the hairs rise on the back of my neck," he said. "It seemed to be between me and the door, so the only thing I could do was turn and face it."* But the thing disappeared. However, it reappeared in a different form the next day when Tandy was doing some work on his fencing foil. "The handle was clamped in a vice on a workbench, yet the blade started vibrating like mad," he said. He wondered why the blade vibrated in one part of room but not in another. The explanation, he discovered, was that infrasound was coming from an extractor fan. "When we finally switched it off, it was as if a huge weight was lifted," he said. "It makes me think that one of the applications of this ongoing research could be a link between infrasound and sick-building syndrome." When he measured the infrasound in the laboratory, the showing was 18.98 hertz--the exact frequency at which a human eyeball starts resonating. The sound waves made his eyeballs resonate and produced an optical illusion: He saw a figure that didn't exist.*
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