Joined: Jun 2005 Gender: Male Posts: 1,151 Karma: 7
infrasound « Thread Started on Oct 29, 2006, 4:58pm »
This is paraphrased from "Spook" by Mary Roach. I found it interesting:
Infrasound is inaudible, low-frequency sound waves. If the source is powerful enough, infrasound can engender all manner of mysterious-seeming phenomena, such as tingling on the back of the neck and “strange feelings in the stomach,” as well as intensification of emotions. Infrasound has also been reported to cause vision irregularities: sometimes blurring, sometimes a vibrating visual field. Peripheral vision is extremely sensitive to movement, a helpful adaptation for dealing with predators that sneak up on you from the side. If your eyeball is dithering, the sides – the peripheral vision – are where it’s going to register. Could infrasound explain seeing shadow people out of the corner of your eye? What if the feelings people report when they think they’ve been in the presence of spirits are in fact the effects of infrasound? Old buildings have thicker, more solid walls, which resonate better. And old abandoned castles and cellars often have no furniture or curtains to absorb sound waves. Infrasound would also help explain why reports of ghosts are often localized – why people sense a presence in just one part of a room. Infrasound tends to “pool” – it registers strongly in the spots where the peaks and troughs of sound waves overlap, and disappears where peak and trough cancel each other out. Infrasound may explain why people sometimes feel cold in the presence of what they take to be a ghost. Infrasound can activate the fight-or-flight response, and part of that response is a curtailing of blood to the extremities. Though it wouldn’t explain when a cold spot registers on a meter.
Joined: Jun 2005 Gender: Male Posts: 1,151 Karma: 7
Re: infrasound « Reply #2 on Nov 3, 2006, 6:20pm »
"Spook" by Mary Roach. Barry recommended it. It's pretty good, I like it because she isn't trying to prove or disprove, she just wants to satisfy her own curiosity. I liked the chapter about EVP and how they did a couple hours of just random recording and then gave it to someone and didn't tell them and they picked out all these "voices". I also liked the chapter where she enrolls in a medium class, and her conclusion is that most mediums aren't frauds they're just people who want to feel special.
Re: infrasound « Reply #3 on May 28, 2009, 9:17pm »
Infrasound is used by some of our largest mammals for communication as well. Elephants and whales both communicate with infrasound and are able to be heard many miles away. One theory that has come up a number of times in the Bigfoot field is the idea that Bigfoot (if it exists) could be large enough to create infrasound. As mentioned in matt's paraphrase above, it has to ability to INTENSIFY emotions. Some Bigfoot witnesses have reported having intense sense of fear, even before sighting the bigfoot or realizing there was one in the area of the eventual sighting. Others have reported this fear without ever seeing a bigfoot and later would find out the area where the fear was felt had regular sightings rep;orted.
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