[sadavis00]

When you talk, you folllow certain social conventions of how to talk (such as being polite), but you don't simulatenously have an inner monologue of what to say and translate that monologue into "polite speech" (especially if the conversation is spontaneous and there is no time for preparation). Given this, what one says is just the same as an inner monologue I might have while alone, in theory. Practically, private monologue in solitude uses no social conventions such as politeness, and in addition, there is much more room to ponder an idea while at the same time doubting it, unlike when you have a conversation, where you can't really express that you doubt or don't agree with what you are saying, that is again a part of social convention where doubt is not easily expressed unless you actually say "I doubt".

When I can't speak spontaneously, that is often a sign for me that something is wrong. Either I don't understand the social conventions of speech in a particular situation, or my mind is disordered such that speech and thought are not "just in time", and I have to think carefully before I speak.

Speaking spontaneously is an public exhibition of your thinking process, it is similar to how you think in private. People who take a long time to speak, and what they speak doesn't really seem to need that much thought, are often suspect, because their lack of spontaneity indicates that they have some reason to not express their thinking process (even if you're lying, if you're doing it spontaneously, the way you go about it also indicates your thinking), or that they simply think slowly (not bad in itself, but all things equal, quick thinking is better than slow thinking).

I am often assumed to be intelligent when I speak, a characteristic not readily apparent in my schoolwork. I assume it is because I have no compunctions in speaking spontaneously. Perhaps other people should try this if they wish to improve how intelligent they seem, even if they don't have a high IQ.