





One possibility is that the electrodes somehow reduce activity in the prefrontal cortex - the area used in critical thought, which Csikszentmihalyi had found to be muted during flow. Roy Hamilton, a neuroscientist at the University of Pennsylvania in Philadelphia, thinks this may happen as a side effect of some forms of tDCS. "tDCS might have much more broad effects than we think it does," he says. He points out that some neurons can mute the signals of other brain cells in their network, so it is possible that stimulating one area of the brain might reduce activity in another.

The first thing I thought of when I read this: The way drinking one (but not more than two) beers can change the way I approach a billiards game. It doesn't improve my skills, per se—I don't suddenly become graceful with a pool cue. But when it's a game that I have some skill at already, like table hockey, one beer is often just enough to allow me to stop over-thinking and just play the game ... making it feel like I'm better at it then than I am stone-cold sober. I'd be really interested to know if/how these experiences are related.