I have to disagree a bit. The more the people I have the better I am at generating ideas, intellectual conversations etc. And the jokes are also funnier when more people are around.
See that's interesting as im the exact opposite, too much stimulation and I shut down and im unable to formulate anything approaching a coherent thought.
I need my time alone to go over the information ive just recieved so as to get an idea or perspective on something.
I often feel guilty because if this happens at some social get together, people often notice that im getting quiet and uncommunicable, but im not doing it on purpose and it is in no way a slur on them, but nevertheless people do tend to get offended by it. I can usually force myself to continue a conversation past my breaking point, but it's hard. It's also hard to describe, I quite literally
need to get away and process this information, to go over things in my head.
For this reason extroversion is somewhat fascinating to me. I believe many people, (although not all), in early life tend to look at themselves briefly and then apply how they are to everyone else around them, which is something I think I did when younger. Obviously as my understanding and perspective grew so did the obvious revelation that in fact, no, some people were not the same as I am and this kick started my fascination with this subject.