I don't find talking and thinking at the same time natural. 'Just think out loud' seems so unnatural to me, I never do it in daily life. I am used to thinking to deep house music not to interviewers staring at me like hungry wolves. Its hard to communicate with someone who already knows the solution to question because you are thinking together and feeding off of each others thoughts like in a normal work situation.

I think the idea of modern open office is built on the same idea that people would be thinking, communicating and collaborating at the same time, but I hate open offices for this precise reason.