This thread is so interesting. smile

I think extroverted and intense are different things -- and that there are different types of intensity. I know some very quiet intense people... like, people who can sit at a computer screen, hardly moving (except those lightning-fast fingers), but you can practically see their brain humming. And, my default is something akin to mellow, but I can get intense pretty quickly (sometimes 'hot headed' would be the better word...) and then back again.