This is a great experiment by Ken Wilbur showing the effects of meditation on EEGs.
It is often headed as him stopping his brain waves. This is probably not quite true, he is rather reducing his brainwaves. It is remarkable how he controls activity and can be selective about it - even in a state where he observes what is happening.
http://susansayler.wordpress.com/2011/01/29/ken-wilbur-stops-his-brain-waves/
