Earlier quoted context omitted.
One of the most important traits of intelligence is understanding and appreciating delayed reward. I saw a gambler win the jackpot. He was really excited and started gathering up all the chips he'd won. Why he was so excited to win a bunch of plastic chips, I'll never know. What's so great about plastic chips? Why was his brain so excited when all he was doing was gathering plastic chips? ... A half-second delay does…
The colorful plastic chips work well enough to trick our dumb monkey brains, just like red notification bubbles.
Similar to the rat knowing the sugar comes very shortly after the task.