Thus, writing things down is a necessity for me: it's not for a need for structure but rather that my "context window" gets filled too quickly. I can counter my own arguments but it's more fun, and often quicker, to do with someone else. Besides, there is such a diversity of thinking out there it would be foolish to not take advantage!
I've only ever heard that associated with schizophrenia, but I don't even know if that's true or not.
It's hard to talk in groups, because you have to have a sentence mentally critiqued by 3/4 people in turn, so the topic has usually changed before you can say your piece.