mibus mentions an article about introverts. In false one-upmanship, I declare that my group is more rare than introverts. Almost every time I've gone through a personality sorter (hmm, sounds painful), I've found myself split between introversion and extroversion. On rare occassion, I've been a point to one side or the other.
It gets worse. I'm not only split between introversion and extroversion, I'm also split between the pairs sensing/intuiting and judging/perceiving. Only in the pair thinking/feeling do I fall clearly to one side: thinking. However, depression is a wicked thing. I am not certain of this, but when depressed I seem to fall to intuiting and judging - slightly.
So, my normal type: XXTX; my depressed type: XNTJ.
(The one-upmanship is false because I'm really just bewildered. Most people I know fall heavy to one type.)
Minimal progress. I wrote my to-do list thinking that doing so would prevent a depressed lull. It didn't work.
[Edited to correct a spelling error.]