So I was wondering, if infrasound’s frequency is so low we can’t hear it, how come it affects our mind and we feel sick afterwards?
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Short Answer – We don’t really know. The study of infrasound is relatively new and we don’t have any conclusive peer reviewed science on it’s effects, if any, on the human body. Of course we have plenty of anecdotal stories piling up, but it’s not conclusively proven that infrasound has medical effects on the human body.
Hypothetical Answer: In nature Infrasound really only comes from climatic weather events – hurricanes, thunder storms, earthquakes, volcanic activity etc. We know that many animals are especially attuned to infrasound and that it affects their behavior so it does make sense that humans may have some, perhaps vestigial, reaction to infrasound on an evolutionary basis.
Infrasound is sound with a frequency below the lower limit of human audibility (generally 20 Hz)1. Most studies reported some effects attributed to infrasound exposure, though many studies also reported no observable effects. Among the more consistent findings in humans were changes in blood pressure, respiratory rate, and balance. These effects occurred after exposures to infrasound at levels generally above 110 dB2. One study has suggested that infrasound may cause feelings of awe or fear in humans1. It has also been suggested that since it is not consciously perceived, it may make people feel vaguely that odd or supernatural events are taking place1.
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