Was looking for the thread about introverts and extroverts and did not see.
I don't know if this was mentioned but us strong introverts are, I presume, often digging into own ideas and seeing if they make sense and where they lead. We live in a world of thought as all people do, but for us it is striking and defining. In fact this defines us in way. For strong introverts it does
That's it, the digging. It does not stop. Not for us "deep" introverts, not that we are deep, but sometimes we are.