The human brain is, in surprising part, an appliance powered by electricity. It constantly generates about 12 watts of energy, enough to keep a flashlight glowing. It works by sending out electrical impulses — bursts of power running along the cellular wires of the nervous system — to stimulate muscles into motion or thought into being. We’re mostly aware of this when the machine falters, when it short-circuits into epilepsy or frays into the tremors of Parkinson’s disease.

So when scientists wrote in a recent issue of the journal Nature that they could induce phantom effects — the sensation of being haunted by a shadowy figure — by stimulating the brain with electricity, it made perfect neurological sense.…  Seguir leyendo »