Would you want to play 'Left 4 Dead' if the zombies could literally sense your fear? Valve is hoping that this kind of biofeedback will make its popular shooter even more fun.
Credit: Valve
Imagine playing through a level of the popular zombie shooter "Left 4 Dead" on a system that tracks your heart rate, eye movements, even how clammy your skin is getting, all to measure just how scared you are.
From NBC News
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