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"The main goal of the Phase I project wad to design and build a breadboard prototype of a temporary personnel incapacitation system called MEDUSA (Mob Excess Deterrent Using Silent Audio). This non-lethal weapon is based on the well established microwave auditory effect (MAE). MAE results in a strong sound sensation in the human head when it is irradiated with specifically selected microwave pulses of low energy. Through the combination of pulse parameters and pulse power, it is possible to raise the auditory sensation to the “discomfort” level, deterring personnel from entering a protected perimeter or, if necessary, temporarily incapacitating particular individuals."
"There is no way the ray gun could deliver sound loud enough to be annoying at nonfatal power levels", says Kenneth Foster, a bioengineering professor at the University of Pennsylvania who first published research on the microwave auditory effect in 1974. ”Any kind of exposure you could give to someone that wouldn’t burn them to a crisp would produce a sound too weak to have any effect,”