I just recently realized that what I think of as buffer overflow is officially called sensory overload. I mean noisy busy babbly situations that "drain my batteries", so I leave. If I stay, my perceptions sort of... stop adding up to a meaningful whole, and eventually I "forget" what talking and moving is. (Luckily it only rarely gets to that point because I stay away from these situations.)
It's not against my colleagues and (potential) friends that I prefer to be alone. From my point of view, it's rather a compliment that I invest the bit of energy I have in them sometimes. Guess that's not much of a compliment.