you guys realize they didn't just pull that out of their ass, right? while skiing is certainly not on the same level, go sit in a fighter jet and have the pilot pull all sorts of high-g maneuvers and see how your body reacts. fighter pilots are trained to take that, you're not, and you'll probably black out or puke. i could see the same thing, to a much lesser degree, being applicable here. also, the eye tracking device they were using is something those of us in the web development (user interface design and user experience, specifically) use pretty regularly during usability testing to see how a user interacts with a new kind of interface. microsoft, apple, google, etc are all definitely using this tech before they roll out new products and services.