The September 2003 issue of Scientific American has several interesting articles about the brain. One of these articles discusses the possibility of actually reading a person's thoughts using either fMRI or EEG. I'm quite sure that mentalists are in no danger of being superceded by technology. However I wonder if this technology may be helpful for magicians.
Here's the link to the website. Unfortunately, unless you have a subscription you can't read the whole article.
http://www.sciam.com/article.cfm?chanID ... A84189F2D7
I'll summarize the relevant point. Apparently, a person telling the truth uses a specific part of the brain. When a person lies they must use the truth telling part in addition to another part of the brain that covers up the truth. I guess the hope is to make a very accurate lie detector.
Obviously we're not going to all run out and perform Triumph while someone takes an fMRI of our brain. But maybe one day the technology will be such that we could. It might be possible to use it as sort of a magical metronome. If we could train ourselves to PHYSIOLOGICALLY conceal the deception, it may be possible to breed a new type of super-magician.