Next time you get an update being downloaded onto your computer don't think that nothing nefarious is going on.
I have known for a number of years that algorithms that 'dither' the screen pixels to provide subliminal programming/messages actually happens but had no hard proof this occurs - until now. Here is a US patent that goes into great detail how this is done. This is the MAIN reason I never install any updates on my system or those that I build and I disable updates at the administrative level. Never had a problem EVER - and I use Windows XP!
Years ago I read the original info at http://jimstone.is, whose website I have always posted as http://82.221.129.208/, and he was the one that posted this patent on his site today. Here is the abstract of that patent, the actual link, and the pdf:
United States Patent 6,506,148
Loos January 14, 2003
Nervous system manipulation by electromagnetic fields from monitors
Abstract
Physiological effects have been observed in a human subject in response to stimulation of the skin with weak electromagnetic fields that are pulsed with certain frequencies near 1/2 Hz or 2.4 Hz, such as to excite a sensory resonance. Many computer monitors and TV tubes, when displaying pulsed images, emit pulsed electromagnetic fields of sufficient amplitudes to cause such excitation. It is therefore possible to manipulate the nervous system of a subject by pulsing images displayed on a nearby computer monitor or TV set. For the latter, the image pulsing may be imbedded in the program material, or it may be overlaid by modulating a video stream, either as an RF signal or as a video signal. The image displayed on a computer monitor may be pulsed effectively by a simple computer program. For certain monitors, pulsed electromagnetic fields capable of exciting sensory resonances in nearby subjects may be generated even as the displayed images are pulsed with subliminal intensity.
[sauce: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=6506148.PN.&OS=PN%2F6506148&RS=PN%2F6506148