Mike Ambinder is the company's very own experimental psychologist and he's been outlining some of Valve's work with biofeedback technology, including eye-motion controls for Portal 2 and perspiration-based gaming adjustments on Left 4 Dead.

ENGADGET

It's hard to get totally excited about a PC hardware peripheral, given the smaller quantity of games (particularly hardware-specific titles) over in desktop land, but with Valve support and what appears to be the perfect control scheme (dual analog sticks, dual fully 3D-sensing motion controllers), we'd say the Hydra has a better shot at winning us over than anything else of its ilk.

ENGADGET: Razer Hydra Sixense motion controller eyes-on