Originally Posted by
Sylvanie
Intrinsic rewards are all those that are inherent to an activity. Curiosity, the satisfaction of overcoming a challenge (as opposed to peer recognition or status gain for overcoming a challenge), feeling in immersed int he world, the joy of an "eureka" effect, socializing as part of a group activity, are all intrinsic. If you're looking for a vista while fighting a centaur, you're just conducting two activities concurrently; looking for the vista is not even a reward, extrinsic or not.
Extrinsic rewards are those that are not an intrinsic, normal part of an activity (obviously, there's a bit of a gray area here). The extreme case is payment for an activity. Other examples of extrinsic rewards are status gains, loot, XP, levels, peer recognition, etc.