I just finished reading Hybrids by Robert J. Sawyer, the third book in his Neanderthal Parallax series. In it, his character discuss "CEMI theory," or "conscious electromagnetic information" theory, which holds that consciousness is a result of the electromagnetic field surrounding and pervading the brain. One of the characters asks if this means that telepathy is really possible -- if consciousness is a result of an EM field, could Person One's consciousness impinge on Person Two's and allow Person Two to read Person One's mind? The woman who brought the whole thing up says that no, CEMI theory has nothing to do with telepathy, because the frequency of the EM waves the brain gives off are in the 1-100Hz range, with the peak being around 40Hz, which means the wavelength of the most active range would be around 8,000km, and the best antenna for receiving an EM signal is one wavelength long. So unless people claiming to be telepathic have an invisible 8,000km antenna coming out of their brain, CEMI theory doesn't give them a possible reason for their telepathy.
I love Robert J. Sawyer -- his fiction involves the most fascinating things.
Anyway, it's an interesting theory, and I'm currently trying to get ahold of the book Quantum Evolution, by Johnjoe McFadden (the person who apparently first put forth CEMI theory) to see what the details are. And I'd welcome any comments here.