Naughty Dog has detailed The Last of Us' dynamic stealth system.
Game director Bruce Straley explained that the PlayStation 3 exclusive will, for example, see the AI acknowledge each other.
"The AI know about each other. They’re searching rooms and they split up but then they’re going to reform and one of them doesn’t show up, he’s going to start asking: ‘Where’d he go?’ They’re going to start looking for their buddy and they’re going to start getting panicked. Suddenly there’s a risk even to taking out somebody stealthily and you still have to move around. That’s part of our dynamic AI system here, our dynamic stealth."
In addition, Naughty Dog has also implemented a system where The Last of Us doesn't pause when players are accessing their inventory.
"Our inventory system is living, meaning the game is still running. You’re not paused when you’re going into your inventory. So it’s just like you’ve pulled the backpack off of your back and you’re in there creating something live while the enemies are moving around the environment and coming to get you if you’ve engaged with them. So what we want to try to do is make you feel that there is a consequence to it"
The Last of Us is currently due for a launch during 2013.