How does he communicate with himself without this monologue?
According to the video, they don't - if they want to communicate with themselves, they speak out loud or write it down. My
guess, again, is that these are people who probably are fundamentally misunderstanding what it means to have a thought. I am sure that every person has some method they use to communicate with themselves internally, without requiring an outward expression of any kind. But what people are labeling as a 'thought' or a 'monologue' is getting lost in translation.
For example, if I asked the person in the video what their political views were, they would most likely be able to describe them without too much difficulty. This is something that is pre-verbal and conceptual, but that cannot be effectively communicated by lists and pictures alone (and I don't mean asking someone to pick their party - which
can be done via imagery, I mean getting people to describe their actual opinions and beliefs).
So there must be
some form of conceptual data happening before the words and images show up and I suspect that is pretty much universal. I think people just have different levels of reliance on that data, or different skill levels in memory production (such as my inability to form images or sounds in my mind). For me, I tap directly into it and don't bother with words until I need them, because it is far faster than words. But others, most likely, believe they are only
having a thought if they have verbalized it somehow.
Again this is all fairly narcissistic, and based in the assumption that people probably aren't that different from me, and I could be totally and 100% wrong and there really is this huge diversity in human cognition that most people don't know about. But more likely, is that people's understanding of a thought and a memory and a monologue is going to be different, which is why they report different things.