For context, I took a psychology class and two acting classes in college, and I realised that what you learn in acting is more about why people do the things they do, and 100% of the time, it's not for no reason. We often have goals, and depending on what we're focusing on or how badly we want that goal, we'll push other goals aside to achieve what we want. There are so many things I've learned in those classes, and there are more advanced classes I'll probably take, even though I'm not an acting or theatre major.
And then there's psychology class, which is just a history class. I'm not even kidding, I took a psychology class in high school and college, and both of them were just the history of all the theories about the brain we've come up with so far (including the very outdated ones).