I've always heard the first group you mention called extroverts (while the second is introvets). I have my old MBTI lit from college, and it seems to agree wit

I've always heard the first group you mention called extroverts (while the second is introvets). I have my old MBTI lit from college, and it seems to agree with that -- extrovet versus introvert has to do with your focus and how you relax. A common introvert versus extravert trait (and is the main one I used for the labels) is that introverts compose internally while extroverts compose externally -- eg, introverts take a few seconds to compose a reply, then say it while extroverts tend to talk their way through coming up with one. That behavior seems to be the one the other introvert/extrovert behaviors cluster around. (It also is one of the fastest to bother the other -- expecting them to compose in the opposite style.)