Science fiction stories frequently have a person don a helmet or something and have foreign memories induced.

Now, according to the National Science Foundation (NSF.gov article), Japanese and American researchers have demonstrated using special MRI's in reverse to "implant" knowedge into a person's brain. The article suggests "it may be possible ... to learn to play a piano ... or hit a curve ball with little or no conscious effort."

Instead of merely recording the activity of a brain, apparently they repeatedly "tickled" small areas of one person's brain in the same pattern that someone else has, who has had some small visual training. After having this done, the subjects were also trained. This happened with or without the subjects knowing ahead of time what was being trained, and with no active participation of subject.