There’s a new game that is controlled by brainwaves. “The game is supposed to measure each player’s brain activity with a band of electrodes worn above the eyes. These pick up the faint electrical signals that emanate from inside our heads. Mindball’s designers at the Interactive Institute in Sweden configured their system to register only a few of these signals–the low-frequency components known as alpha and theta waves. Alpha and theta, they tell us, are generated when the brain is ‘calm and relaxed.’ To win a game of Mindball, then, you have to out-calm your opponent.”