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The document details how very weak electromagnetic fields pulsing at certain slow frequencies can produce measurable physiological effects in humans. These pulses can stimulate the skin in a way that interacts with the body\u2019s sensory systems.<\/p>\n
Some computer monitors and older TV tubes naturally emit pulsed electromagnetic fields when displaying flickering or pulsing images. In theory, this means it might be possible to influence a person\u2019s nervous system by controlling the pulses coming from a nearby screen.<\/p>\n
The patent described embedding the pulsing in the video content itself or adding it to the signal, either as a subtle overlay or through a simple computer program. In certain conditions, even pulses too faint for the human eye to notice, known as subliminal pulses, could generate these effects.<\/p>\n
Originally filed in 2001, the patent has resurfaced on virtual communication networks on March 2 and has been viewed hundreds of thousands of times already.<\/p>\n
However, that patent expired in 2021, meaning it is now in the public domain. Anyone can freely use, copy, build, or improve on the technology without infringing the patent or paying royalties.<\/p>\n
Its discovery online has already caused many people to claim that unknown parties have been using screens to monitor and manipulate viewers since the television was originally invented.<\/p>\n
The patent\u2019s creator, Hendricus G. Loos, a physicist based in California who also worked for NASA in the 1970s and 80s, even claimed that the signals could control human autonomic functions, such as heart rate or digestion.<\/p>\n
The invention officially received a patent number from the US Patent and Trademark Office (USPTO) in 2003, being classified under \u2018magnetotherapy<\/em>,\u2019 which includes devices using magnetic fields for health or physiological effects.<\/p>\n Researchers for PQAI, a nonprofit that builds AI tools to help the public search and understand patents, recently reviewed Loos\u2019s invention and noted that modern LED screens emit much weaker fields, so it might not work as well today without modifications, which anyone is now free to make.<\/p>\n Originally, the manipulation focused on old-style monitors that naturally give off EM fields when they display images. These fields were created by the way the screen refreshes or changes brightness.<\/p>\n Loos found that the key was to make the image on the screen pulse or flicker very slightly at low frequencies between 0.1 and 15 Hertz (Hz) \u2013 an internationally used measurement of frequency.<\/p>\n This could have been done with simple software on a computer using programs that adjust brightness rhythmically. Loos noted that you could also modify TV signals directly by embedding pulses in video streams or radio broadcasts.<\/p>\n