“[I]nvestigators have used an MRI to read images off the visual cortex […] Before you get all panicky and worry that now the CIA will be able to extract all of those sexy librarian fantasies out of your brain by aiming a gadet at your head, relax. This is an interesting piece of work, but it has some serious limitations.” —PZ Myers, Soon, we’ll be reading your minds!
See Myers’ post for examples of reconstructed images and additional links.
Because this is sort of a follow-up to my Synthetic Telepathy post, I should supply more information on tinfoil hats:
It has long been suspected that the government has been using satellites to read and control the minds of certain citizens. The use of aluminum helmets has been a common guerrilla tactic against the government’s invasive tactics . Surprisingly, these helmets can in fact help the government spy on citizens by amplifying certain key frequency ranges reserved for government use. In addition, none of the three helmets we analyzed provided significant attenuation to most frequency bands. —Rahimi, et al, On the Effectiveness of Aluminium Foil Helmets: An Empirical Study