We think we communicate mostly with words. But the fact if we don't know exactly how much communication or information exchange is happening on the subconscious level. We understand so little about the brain, and consciousness that this question is unequivocally unanswered - exactly how much information exchange happen on the subconscious level. I think it is far more than we think. The conscious brain is good at reasoning after the fact i.e. coming up with reasons why we think a certain way. And these reasons are not always right - they are just an attempt by the pre-frontal cortex to make sense of how we are feeling at the time. e.g. you meet someone for the first time. There is a lot of information exchange happening. Just you looking at this person, there are processes in your brain forming an idea about this person - they way he looks, the way he walks, the way he moves, the way he smells, the way he talks, his facial expressions etc. etc. there are many other non-verbal data ...
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