What happened in the milliseconds before a behavior to cause it? That's in the neurobiological realm.
Robert M. SapolskySome Poor grad student pressing on the flanks of a hamster and out comes a doctorate on the other side
Robert M. SapolskyFinish this lecture, go outside, and unexpectedly get gored by an elephant, and you are going to secrete glucocorticoids. There's no way out of it. You cannot psychologically reframe your experience and decide you did not like the shirt, here's an excuse to throw it out - that sort of thing.
Robert M. Sapolsky