Under self-determination theory, there's actually a spectrum of motivational types. So, if we could draw three categories here. At this end of the spectrum, is what they all A motivation. And what that means is, you have no motivation one way or the other. You are totally indifferent to the activity. That's called being a motivated. At the other end of the spectrum, is Intrinsic motivation. Here, you do the thing for no reason other than, that you love it. You do the thing. Because it is rewarding in and of itself. That's the strongest form of motivation, because it takes nothing external at all, to get you to do the activity. So, this is what we find, in a really great game. You're not doing it for money, you're not doing it for fame, you're not doing it for status. You're doing it because it's fun. In the middle, there is the broad category. Of Extrinsic motivators. And, what self-determination theory says, is that there's actually a spectrum from the most external, to the most internal forms of extrinsic motivation. So, all the way over here, closest to a motivation, the most external, they call external regulation.