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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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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