Scientists have given a new meaning to the term "reading" one's mind: they've developed technology that converts brain activity into an image.
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At the Donders Institute for Brain, Cognition and Behaviour at Radboud University in The Netherlands, a research team used a functional magnetic resonance imaging machine, or fMRI, to see what areas of the brain were active when a person looked at a letter. The pattern of activity was then "translated" into an image of the letter itself.
An fMRI detects areas in the brain that have more blood flowing into them. That's what lets neuroscientists say that a given area is responding to some activity or stimulus.
The experiment involved scanning the occipital lobe, a region at the back of the brain where visual information gets processed, of people who had been told to look at letters (B, R, A, I, N and S). From the scan, the fMRI created a speckled image. Next, using a computer program that the researchers developed, they translated the speckled image into a letter.