I must confess: my behavior is governed by my state. If I didn’t get enough sleep, I’m going to be a bit tired. If I had a drink, I wouldn’t get behind the wheel. All of these are states and they govern my behavior: how I feel, and what I can and cannot do.
I can, of course, transition from one state to another. I can go get a coffee, and this will take me from sleepy to alert (I hope!). So we can think of coffee as a trigger that causes a transition of yours truly from sleepy to alert. Here, let me clumsily illustrate it for you:
2 sleepy --------> alert
So, the ...