Well, what exactly is meant by "psychological arousal"? If it's anything like "stimulation", I can see where the two would go hand in hand.
When I was a kid, I would get really annoyed, frustrated, and overwhelmed when there were to many people around for too long (I consider this over-stimulation.) so much so that I would tell my mom's guests, "This is my house, and it's time for you to leave."
Now, I still can't handle too much social stimulation. There are certain peopole I am very comfortable with that I could hang out with all the time and not feel over-stimulated; but, aside from these, too much social activity still stresses me out, to the point of depressing me. It's nothing against these certain people who don't have the exception. I think part of it relates to how well I know the person and is also affected by how extraverted/energetic that person tends to be. (The more low-key the better.)
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