I thought this was interesting regarding INFRASOUND effects on Humans

[Guest guest]

Below is an excerpt from Wikipedia regarding something

called " infrasound " which is apparently very low frequencies that

humans can't hear, but can cause extreme anxiety as well as other

emotions. I don't think it says in this passage, but I also read

somewhere else that some frequencies affect some people, while other

frequencies affect others.

Couldn't it be possible that people with 4s are being bothered by

everyday soft sounds with low frequencies, and other people aren't

affected by these same frequencies? Usual offensive frequencies

would be inaudible to most people, but maybe the frequencies 4s

people are affected by are audible, but just offensive to them.

Just thought it was interesting. I know that several individuals on

this site hate the discussion of frequencies as the culprit, but I

think it's worth looking into (if we ever get someone to research it):

Human reactions to infrasound

Infrasound has been known to cause feelings of awe or fear in humans.

Infrasonic 17 Hz tone experiment

On May 31, 2003, a team of UK researchers held a mass experiment

where they exposed some 700 people to music laced with soft 17 Hz

sine waves played at a level described as " near the edge of hearing " ,

produced by an extra-long stroke sub-woofer mounted two-thirds of the

way from the end of a seven-meter-long plastic sewer pipe. The

experimental concert (entitled Infrasonic) took place in the Purcell

Room over the course of two performances each consisting of four

musical pieces. Two of the pieces in each concert had 17 Hz tones

played underneath. In the second concert, the pieces that were to

carry a 17 Hz undertone were swapped so that test results wouldn't

focus on any specific musical piece. The participants were not told

which pieces included the low-level 17 Hz infrasonic tone. The

presence of the tone resulted in a significant number (22%) of

respondents reporting anxiety, uneasiness, extreme sorrow, nervous

feelings of revulsion or fear, chills down the spine and feelings of

pressure on the chest.[10][11] In presenting the evidence to the BA,

the scientist responsible said " These results suggest that low

frequency sound can cause people to have unusual experiences even

though they cannot consciously detect infrasound.