![]() The audible part of the spectrum shows the threshold of human hearing, and plots of equal loudness (measured in phons). The audio spectrum, showing infrasound, sound and ultrasound. Sonic weapons fall into two categories: those that involve audible frequencies, and those that are either ultrasonic or infrasonic and so are inaudible. ![]() Instead, these injuries are probably the side effects of intrusive surveillance. It is unlikely to be the result of a deliberate “sonic attack”. Little is known for definite but the symptoms do suggest that some sort of sonic interference could have taken place. ![]() Victims have reportedly experienced mild brain injuries with symptoms including “subtle and vague, but abnormal, sensations of sound and pressure”. Reports of “sonic attacks” in China, and previously in Cuba, have left many wondering whether sonic weapons could be targeting US diplomats. ![]()
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