Research by NASA in the 1970s showed that this effect occurs as a result of thermal expansion of parts of the human ear around the Cochlea , even at low power density. Later, signal modulation was found to produce sounds or words that appeared to originate intracranially. It was studied for its possible use in communications but has not been developed due to the possible hazardous biological effects of microwave radiation. Similar research conducted in the USSR studied its use in Non-lethal Weapon ry.
For centuries, humans have reported hearing unexplained noises in conjunction with also led to many reports of observers hearing crackling or fizzing noises. Similar observations have been reported by soldiers near the site of Nuclear Explosions .
Colin Keay , a physicist at the University of Newcastle in Australia, has advanced a hypothesis that purports to explain these phenomena. According to Keay's theory, meteor trails give off very low frequency (VLF) radio signals that the human ear cannot sense directly but are heard because a Transducer on the ground must be converting the radio waves into sound waves. He has produced experiments that demonstrate that materials as commonplace as aluminum foil, thin wires, pine needles, and wire-framed glasses can act as suitable transducers.
Powerful VLF waves can induce physical vibrations in these objects, which are transmitted to the air as sound waves. Keay defines the field of , very bright Auroras , and Earthquakes .
field is responsible for the Magnetoreception systems of birds. Specifically, they propose that this transduction may take place in a class of photoreceptors known as Cryptochrome s.
In general, there is scientific evidence that waves at different levels of the Electromagnetic Frequencies have physiological effects on people exposed to them, including auditory effects.
- can induce visual effects. This was discovered in 1895 as reported by G. Brandes who saw a uniform blue-gray glow that scientists say is likely the result of direct excitation of retinal nerve cells.
- were first reported to cause visual perception of flashes of light during the Apollo program. Astronauts en route for the Moon were subject to Cosmic Ray s bombardments, inducing some Cherenkov Effect in the fluid of their Eyeball s.
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.
Sharp and Grove developed Receiverless Wireless voice transmission technologies for the Advanced Research Projects Agency at Walter Reed Army Institute of Research , in 1975.
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