Ygrec23, my husband does that, and his T thinks it's part of his ADHD. My T says he thinks it's partly anxiety, based on his one meeting with my husband. My husband and I have discussed it, and he working on it, but he still sucks at letting me talk without interrupting. I have suggested to him that it's possible to THINK something without saying it, but he says it's almost like the two are simultaneous, or that he MUST say something in order to think it. Doesn't make sense to me, but . . .