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According to the Working Paper on Infrasound Weapons produced by Hungary for the United Nations in 1978 4, the frequency that is thought to be most dangerous to humans is between 7 and 8Hz. This is the resonant frequency of flesh and, theoretically, it can rupture internal organs if loud enough. Seven hertz is also the average frequency of the brain’s alpha rhythms; thus this frequency has been described as dangerous but also relaxing. Whether exposure to such infrasound can trigger epileptic seizures, as some fear, remains unclear; experimental data on exposure to such frequencies gives a variety of results. It should be noted, however, that the strobe light effect associated with triggering epileptic seizures flashes at an equivalent rhythm. Frequencies below 50Hz commonly lose their coherence and are perceived to pulse or fluctuate, which is analogous to the strobing beat of a modulated light.