That's what I've always heard as well. I think this might be a useful reference as well: http://en.wikipedia.org/wiki/Extraversion_and_introversion http://en.wi

That's what I've always heard as well. I think this might be a useful reference as well: http://en.wikipedia.org/wiki/Extraversion_and_introversion http://en.wikipedia.org/wiki/Extraversion_and_introversion In terms of a test, the MBTI (http://en.wikipedia.org/wiki/Myers-Briggs_Type_Indicator http://en.wikipedia.org/wiki/Myers-Briggs_Type_Indicator) is pretty good IMO.