Incorrect. It has been explored extensively, for various medical purposes. It is in the nanowatt range (very very little).
One of your problems is that you try to make up for your lack of knowledge with guesswork.
Hans
I'm not sure which -ography you mean. If you're talking about electroencephalography, that's measuring an electrical potential, not the radiated electromagnetic power. Standard EEG measurements are in microvolts and are measuring the voltage difference across various standardized points on the scalp. Electrocorticography does the same thing, but with the electrodes on the cortex itself. There's also promising technology coming out of Australia that uses endovascular electrodes. The brain has a very weak electrical field, but electric field encephalography is a thing. It requires considerable signal processing to obtain a usable reading, and that may be where you're getting values in watts. For a power density measurement, it would need to be normalized to a reference surface area. The brain also has a magnetic field, but it's even weaker, and magnetoencephalography exists too, and has the same limitations.
But as you would expect, electromagnetic radiation was one of the first things proposed to explain ESP and hence one of the first things eliminated by science via measurement, going back to the 1940s. The only measurable electromagnetic radiation emitted by the brain is in the infrared band. But then again, your buttcheeks also emit electromagnetic radiation in the infrared band, because both they and your brain are body-temperature objects.
The practical limit is that if a brain were emitting 10-20 watts of EMR in the radio-frequency band, it would be trivially easy to detect. In fact, it would be highly annoying to anyone else in the vicinity trying to do various things with some kinds of electronic equipment. We can easily rule out electromagnetic radiation as a practical vehicle for ESP.
But we have the cart before the horse. Scrambling to find a mechanism to explain an observation must wait until there's an observation. That is, the ability of a person to guess what someone else is thinking at a rate greater than chance is the inescapable requirement. Michel simply declares that he doesn't need to do that and that anyone who says he does must be a simpleton. Paradoxically he's still trying to get that happy
p-value, but he has to visibly cheat to do it.