and some people's brains just don't "work" like that. when someone else is talking, i try to listen, and i'll often lose my own thoughts. i also take time to put my thoughts into words, which the chattier end of people tend to take as an opportunity to speak into the void with filler, further distracting me and forcing me to try to listen, losing my thought.

some people's brains don't work in a way that "thinking out loud together" is an effective strategy.