This video makes me want to get an EEG machine. It’s of Ken Wilber narrating footage of himself moving through a few different meditative states while hooked up to an EEG machine. (EEG machines show you a picture of the electrical activity from your brain from electrodes on your scalp.) He says what each state feels like, too. Pretty neat.

(Minor correction: He makes it sound like dreaming sleep is mostly associated with theta waves, which is not quite true. Dreaming sleep does have some theta activity, but it’s mostly beta or “beta-like” waves. Theta is strongly associated with stage 1 sleep, that 5 or 10 minute transition between waking and sleep. It’s a minor point, but I so rarely find corrections to make in his work, I thought I’d take this chance.)