A recent study on LSD, also posted here, showed a simmilar pattern: a reduction of alpha activity and an increase in theta, beta and gamma activity.

It's interesting that people who meditate often and who've been doing that for a very long time, have a very simmilar type of brain-activity, except for the beta waves. But people who don't meditate frequently will experience the exact opposite when they start meditating. They will have an increase in alpha activity, and a decrease in beta activity.

The thing is: i've noticed before that meditating for me, never increased the intensity of psychedelics, but always decreased it. It realy adds up. The alpha state is the opposite of the psychedelic state.

Psychedelics seem to broaden the spectrum of brain activity. Both the very low and the very high frequencies are being increased.

I suppose you could enhance the psychedelic experience with binaural beats, if you would find the right rhytmic patterns.