shrug I do both. Depending on the context, I might think about some subjects verbally and about some subjects non-verbally. If I am thinking about something social, having to do with people interactions, I will generally verbalize things in my head, replay or imagine dialogues, etc. If I am trying to understand something I just learned, I will often try to explain it to myself in words. But if I am solving a logic puzzle or trying to work out an algorithm or look at something beautiful like a painting or statue or a flower, I don't verbalize my thoughts. I can still feel myself thinking, I get the results of the thinking process, but I only start verbalizing again when the non-verbal part is done.