I think in concepts, in ideas, in abstract compilations of multiple feelings condensed into a singular wordless thought. This is why it’s very hard for me to communicate, as I have to translate complex concepts emerging in my brain in fractions of a second into simplistic human language, which can’t even properly convey it. In this way I feel a bigger sense of commonality with computers, than humans.
I wouldn’t say it has a correlation to imagination, albeit mine is pretty good anyway. It’s hard to convey in words, but I just understand what I think. I don’t need to monologue, I just get an idea of what I think in a split second and then have to translate it to the language I speak. It makes me quite good at pattern recognition, but interacting with people is much harder, I sometimes spend dozens of minutes just to write a comment. Sometimes I also feel like making noises better entails what I think than words.