That's an interesting thought. Many of the things that I've read say that introverts tend to be better writers while extroverts tend to be the talkers. In many ways, I agree with that conclusion. Writing is mostly a solitary activity that requires a great deal of delving into one's own mind to put together ideas and express them in words. Those are introvert characteristics. Talking is something that requires another person present and can be much more spontaneous.
One article that I read said that introverts are people who like to think before they talk while extroverts are people who believe that talking is thinking. That statement was probably written by an introvert trying to take a jab at extroverts, but I mentioned it to an extrovert at work. His response was that "thinking by talking" wasn't such a bad idea. I roll my eyes at that kind of of thought process, but apparently it works well for some people.
I'm not sure that introverts and extroverts have that different a sense of humor. I suspect that extroverts are more likely to express their funny thoughts more quickly, but I don't know that differences are truly generalized that way.
Bill
To be honest it depends on the context and the social situation. As an example, it's always been easier for me--as an introvert--to express my humor in written form. It also gives me a chance to use my humor in some very unconventional ways.
...like, um this for example. :)
I think maybe I am more extrovert than I appreciate but sometimes can be masked with a little bit of unsure or shyness which is not quite the same.
Once that is overcome then my extrovert character comes out, on the other hand one can sometimes be over extrovert to cover up shyness, so that is why I agree I am a mixture.