I just read "Flim-Flam!" from James Randi. James Randi is a famous debunker of the paranormal. In the book, he says that it is not even clear what we mean by EEG coherence between different parts of the brain during meditation. He says that it is an illusion created by defective apparatus, etc.

I checked Google Scholar on the subject (in connection with the Dalai Lama because he a popular figure) http://scholar.google.com/scholar?hl=en&lr=&client=firefox-a&q=eeg+coherence+meditation+Dalai+Lama&btnG=Searc h and it seems well defined and well studied, etc., not even close to the paranormal. Similar research was done with Transcendental Meditation, which is also very well known.

Why does Randi, a debunker of the paranormal, claimed so strongly that it is an "illusion", etc. Anyway, what EEG coherence should has to do with the paranormal? Has James Randi just brought confusion instead of useful information? I have no recent reference for his claims. Did he change his opinion?