Forget dance mats and joysticks, even trance vibrators: biofeedback is the cool interface on my Christmas wishlist. Slide three rings on your finger, pay $150 (or a little less) and play The Journey to Wild Divine, Steven Johnson writes in his December column on emerging technology. Wilde Divine is a game where you aim an arrow by altering your mood – and thereby the electrical impulses those rings measure on your finger. Or breathe in time with bellows to light a fire. To succeed you need to reach a state of meditative calm quite opposite to the cramped anxiety I experience when I try to play shooters. And do you know, one of the aims of the game developers is “teaching the user to regulate internal systems without going on a Transcendental Meditation retreat or signing up for a yoga class.” Intriguing, no?