Anyway, it's mostly true. The mouth tends to carry on in a linear fashion, going from word to word and trying its damnedest to construct a meaningful collection of sounds. The brain can spin on its axis forever. When you start talking, you can make sense of the jumble upstairs and possibly find that light you were looking for. On the other hand, your conversation partner might just need you as much as you need them.
Talk is good.
Remember that listening is important, too. Getting the juices flowing should sometimes be taken literally, and that means using your body. Drinking eight glasses of water a day is great, but there's a reason you need all that saturation. I am sure my neighbor thinks me insane when he happens to glance next door and see this huge guy boogying his butt off and making that White Guy dance face which is so cringingly embarrassing on the dance floor but when done in the privacy of one's own room or cubicle seems to satisfy some deep-seated inner urge that is best left uninvestigated. When a good song comes on and I want to start moving, I usually move.