Sony's Jack Tretton has dismissed Microsoft's Natal movement control scheme, branding it a great idea that Sony "invented eight years ago."

Speaking with Gametrailers TV, the SCEA boss touted the company's PlayStation Move, saying: "ultimately this is next generation gaming."

When asked if PlayStation Move is an attempt to capture some of Nintendo's success, he replied: "We've kind of been looking for the right opportunity to bring motion gaming in a PlayStation like experience. We really feel that with the right combination of the PlayStation Eye and our Move controller we've really got the opportunity to bring realistic gaming with motion to consumers for the first time."

However, Tretton wasn't afraid of making a similar comparison between Natal and the PlayStation EyeToy.

"If you really want to get involved in playing with a camera I suggest you go out and buy a $99 PlayStation 2 and play some of the great technology we invented eight years ago," he said.

While Tretton refused to confirm what the company would announce at E3, he admitted that Killzone 3 was inevitable.

"We own Guerrilla Studios and they did a great job on Killzone 1 and 2 - I don't know when you'll see any announcements about it but I can promise you a Killzone 3."

Although it's hard to deny MS' "wave frantically at the TV in the hope that something happens" idea is a thoroughly crap one.

Microsoft has issued a clarification explaining that Natal is not dependant on the size of gamers' rooms to work properly - following reports that at least 13 feet of clear space was required.

"The comments recently about the play space for Project Natal were misinterpreted," the software giant explained in a statement. "It is true that the Project Natal sensor reads the configuration of your room and adjusts play space, as appropriate."

"We know that living rooms come in all shapes and sizes, and have conducted numerous play tests to ensure everyone will be able to jump off the couch and into the fun when Project Natal launches globally this holiday."

Earlier this week, Microsoft exec. Hsiao-Wuen Hon let slip that the company is already at work on a sequel to Project Natal.