Mysteriously snuffed out candles, weird sensations and shivers down the spine may not be due to the presence of ghosts in haunted houses but to very low frequency sound that is inaudible to humans. British scientists have shown in a controlled experiment that the extreme bass sound known as infrasound produces a range of bizarre effects in people including anxiety, extreme sorrow and chills — supporting popular suggestions of a link between infrasound and strange sensations.
“NORMALLY YOU can’t hear it,” Richard Lord, an acoustic scientist at the National Physical Laboratory in England who worked on the project, said Monday.
Lord and his colleagues, who produced infrasound with a 23-foot (7-meter) pipe and tested its impact on 750 people at a concert, said infrasound is also generated by natural phenomena.
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