Deaf and non verbal people - Internal monologues/thoughts

I read a statistic about how only 30-50% of the world's population have an internal monologue, and that the remainder of people see their thoughts as visions only. This in itself made me so curious as I can't even imagine life without an internal monologue (the bane of my existence). I then started to think about deaf and non-verbal people... If there's anyone here that can put my curiosity to bed... What do your internal thoughts look/sound like?