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Can you hear the sound of microwaves? Reveal the wonderful phenomenon of human hearing!
The Microwave Auditory Effect is the human perception of sound caused by pulsed or modulated radio frequencies. This phenomenon is sometimes called the "Frey effect," and its characteristic is that these sounds are generated directly in the human brain without the need for any receiving electronic equipment. The phenomenon was first reported by people working with radar equipment during World War II, and was further studied by American neuroscientist Allan H. Frey in 1961, who studied microwaves. The nature of auditory effects published research results.
The effect is thought to be caused by thermoelastic expansion of certain parts of the auditory organ, although other theories explain different results.
Discovery of the microwave auditory effect
Frey's research found that subjects could hear appropriately pulsed microwave radiation at distances ranging from a few inches to several hundred feet from a communications transmitter. In his experiments, pulses with a frequency of 50 Hz and pulse widths ranging from 10 to 70 microseconds were used. The study noted that perceived loudness is related to peak power density rather than average power density. According to Frey's observations, the perceived peak power density at 1.245 GHz is below 80 mW/cm². The sound produced is described as a "buzzing," "clicking," "hissing," or "knocking," depending on several parameters of the transmitter, such as pulse width and pulse repetition rate.
The mysterious mechanism of human hearing"Depending on the transmission parameters, it can induce a severe sensation of head vibration without causing obvious vestibular symptoms such as dizziness or nausea."
Aural sensations such as clicking or buzzing have been reported by some operators of modern microwave transmission sites for transmission frequencies ranging from about 200 MHz to at least 3 GHz. The cause of this effect is thought to be thermoelastic expansion of certain parts of the auditory apparatus, and the generally accepted mechanism is that the rapid (but small, in the range of 10−5 °C) heating caused by the pulse creates a pressure wave that travels through the skull. Delivered to the cochlea.
Applications in Electronic Warfare
Between 2003 and 2004, the U.S. Navy commissioned WaveBand to design a microwave auditory effects system called MEDUSA, which was designed to temporarily render a person unconscious through remote application. However, experts such as Kenneth Foster, a professor of bioengineering at the University of Pennsylvania, question the effectiveness of the device because, based on human biophysics, the device "will work if you are distracted by sound." I killed you before." This view is also recognized by other experts.
Unsolved health problems
The microwave effect has also been proposed as a factor to explain illnesses suffered by U.S. diplomats in Cuba and China in 2017 and 2018. However, this explanation has sparked heated debate. Bioengineer Kenneth Foster said of the diplomats' health, "It's crazy, but it certainly wasn't microwaves." As of October 2021, microwaves remain one of the leading hypotheses.
The growth of conspiracy theoriesMany people who claim to be suffering from voice hallucinations, paranoia or other mental illnesses claim that government agents use mind control technology based on microwave signals to transmit voices and thoughts into their minds, which is called "voice control." "Voice to skull" or "V2K". These voice control issues have attracted a large number of support networks and websites run by people who worry about being controlled. Mental health professionals say many of these sites show signs of paranoia, but opinions are divided over whether they exacerbate psychological problems or serve as a form of group social support.
“The ‘mind control experiences’ reported by many people indicate a high degree of influence by delusional beliefs. 」
The microwave auditory effect undoubtedly reveals the complexity and mystery of human perception, but whether we can really hear the sound of microwaves may still be a question worth exploring in depth?
