The vast majority of people have an ongoing conversation with themselves, an inner voice, that plays an important role in their daily lives. But between 5-10 per cent of the population do not have the same experience of an inner voice, and they find it more difficult to perform certain verbal memory...
I mean I can have an inner dialogue, but normally it goes straight onto the idea level of thinking and I don't waste resources trying to shape it into words. I can do that, though.