The stress response activates certain systems, shuts down others, and creates agitation that promotes movement or speech.

“So, basically the stress response, this is the key phrase here, the stress response A, is generic, I said that before, and B, it basically pushes certain systems to be activated and other systems to not be activated. So, the stress response is two-pronged. It's a yes for certain things and it's a no, you may not right now for other things. ... And then it's a sense of agitation that makes you want to move. And that's because fundamentally, the stress response is just this generic thing that says do something.”