When we are asleep most neurons oscillate at a very slow rhythm. That's how cells control consciousness—by voltage, by becoming electrically inactive or active. If you take a drug, if you fall asleep, if you get hit in the head, the brain does not generate the functional state that is you. The you disappears.  neuroscientist Rodolfo LlinĂ­¡s of the New York University School of Medicine.

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