I can't remember the exact term, but I know there a medical term to describe this problem. It's a three word term like "stream of thoughts" and it's a very strong indicator of attention deficit disorder. People with real ADD talk and act like they're on cocaine. It takes 20 minutes and thousands of words to answer a simple question. Things written by a person with ADD will often be very long and difficult to follow.
I actually have something like it, but if you follow the entire explanation I give to certain questions, it's because I've thoroughly exhausted all avenues of thought on the matter and map out the entire decision for you.
It's a bad thing when people less intelligent than me confuse the two into "medical issue", when I'm the one who's generating multi-tiered mindmaps that span several feet on a monitor for certain life decisions I've made. In other words, "-too- logical" for people who can't follow my line of reasoning. For those that can, they say "oh, I see, those are a lot of things I didn't think of"
Note, this is different from "unable" to, though I technically do struggle to be succinct for certain complex questions.
I have begun defaulting to "simply not talking" because it's usually not worth my breath.