Bio-feedback tried out in test controllers says chief architect Cerny.
Speaking with Stuff, Cerny explained that by detecting the players' galvanic skin response, which hinges on how much people are sweating, designers could make more responsive games.
"We had a long research project where we looked at pretty much any idea we could think of," he revealed.
"Would it help to measure the galvanic response of the skin? We tried out a tremendous number of things - and then we went to the game teams to ask them what they thought they could use from the controller."
Valve Software also revealed it was experimenting with biofeedback, with the company's in-house psychologist saying it allowed them to tailor make games to keep each user interested.
“It’s still experimental, but it worked pretty well, and we were pleased with that,” commented psychologist Mike Ambinder.