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The Microwave Auditory Effect, also known as the microwave hearing effect or the Frey effect, consists of audible clicks (or, with speech modulation, spoken words) induced by pulsed/modulated microwave frequencies. The clicks are generated directly inside the human head without the need of any receiving electronic device. The effect was first reported by persons working in the vicinity of radar transponders during World War II. These induced sounds are not audible to other people nearby. The microwave auditory effect was later discovered to be inducible with shorter-wavelength portions of the electromagnetic spectrum. During the Cold War era, the American neuroscientist Allan H. Frey studied this phenomenon and was the first to publish information on the nature of the microwave auditory effect. Pulsed microwave radiation can be heard by some workers; the irradiated personnel perceive auditory sensations of clicking or buzzing. The cause is thought to be thermoelastic expansion of portions of the auditory apparatus. Competing theories explain the results of interferometric holography tests differently.〔http://www.sciencemag.org/content/209/4461/1144.extract?sid=f514230e-1373-4da5-ad36-3689f428e21b〕 In 2003-2004, the WaveBand Corp. had a contract from the US Navy for the design of a MAE system they called MEDUSA (Mob Excess Deterrent Using Silent Audio) intended to remotely, temporarily incapacitate personnel. The project was cancelled in 2005. ==Primary Cold War-era research in the US== The first American to publish on the microwave hearing effect was Allan H. Frey, in 1961. In his experiments, the subjects were discovered to be able to hear appropriately pulsed microwave radiation, from a distance of 100 meters from the transmitter. This was accompanied by side effects such as dizziness, headaches, and a pins and needles sensation. A decade later, an overview, in the ''American Psychologist'', of radiation impacts on human perceptions, cites investigations at the Walter Reed Army Institute of Research that demonstrated 'receiverless' wireless voice transmission: "Appropriate modulation of microwave energy can result in direct 'wireless' and 'receiverless' communication of speech."〔D.R. Justesen. "Microwaves and Behavior", Am Psychologist, 392(Mar): 391–401, 1975.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Microwave auditory effect」の詳細全文を読む スポンサード リンク
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