As I've heard it defined, extroverts gain energy from social interactions, introverts are fatigued by them. If, like me, after a few hours of small talk you feel exhausted and want to sit in front of a screen alone, you're probably an introvert. I have some extroverted friends who will not go to the grocery store unless someone goes with them to keep them company. I prefer taking walks alone, and so on.
> I have some extroverted friends who will not go to the grocery store unless someone goes with them
We did a teamwork exercise where they split the E's and I's. To both groups, they said that you have the next day off - tell us what you're going to do. The E's were going nuts with chartering a plane to Vegas, big party while all of the I's were going to do something alone, maybe even just catch up on laundry. The difference was shocking.
In another exercise, they had an E monitor a team of us I's on a logic puzzle. As the E later described, he was just basically watching us I's sit there and not say anything and then a few minutes later - we started talking. We won but the non-talking communication really weirded him out.
