 I think we'll start this out with an example of the Hilbert chain as you're going to have eight past five in the clouds. You grab by the function. We might be wrong. We're funny. Welcome back to The Behavior Beast. This time we're going to talk about the weird elusive and totally catatunky S-Delta. And we're going to do it using an awesome basketball game. Go Zags! Folks, welcome back to The Behavior Beast. Here's another one. This is about discriminative stimuli. No, it's actually about S-Delta. Okay, but S-Delta is a discriminative stimuli that interacts with each other. So remember when we're developing stimulus control, and once stimulus control is developed, once we have a discriminated operant. In other words, we have behavior occurring in one context and not in another, right? And then the reinforcement occurs in that context. So there's your discriminated operant. Well, you have to also realize that when that stimulus is in present, that scenario is called an S-Delta. So there's no signal for reinforcement at the moment for particular behavior. The video that this is in the context of is the basketball game, right? So our home team, the Zags, they're awesome. We love them, right? But with the crowd cheers against the other team when they're trying to make a free throw, okay? So if you watch that video carefully, what you'll see is that the other teams getting ready, they go up for a free throw, right? So when they go up for that free throw, they're screaming, you can see the guy's hands and they're waving, they're doing all this crazy stuff. And they go up for that free throw and as soon as that ball leaves the guy's hands, that's S-Delta. Crowd trying to boo the dude, right? Trying to get him to miss. So when that happens, if you continue to go, make crazy stuff, there's no reinforcers for that. The ball is already on its trajectory. It's going to make it or it's going to not. So watch carefully with that video and you will see that ball go up and they start to, they go down and like the volume of the crowd goes down, the camera go down, the other hand's going to go down. And when the ball makes it, almost dead silence, right? Why? Well, because there's really no reinforcers available for any sort of cheering on the home team at that moment. Where stuff is. So anyway, I hope I've made some sense for you. S-Delta is a tricky concept, but it's really about what happens when no SD is present. So signaling that no reinforcers are available for a particular response at this moment. That's all there is. See you. Thank you.