A great deal of my thinking is done using an internal monologue. I have no problems with my hearing or speech, so that internal monologue happens to take the fo

A great deal of my thinking is done using an internal monologue. I have no problems with my hearing or speech, so that internal monologue happens to take the form of spoken language. While I don't think formal spoken language is necessary to think, I would think some sort of formal language is necessary for higher levels of thought.