I've had similar experiences at work. I "narrate" pretty much everything I do - which I can do silently when I put my mind to it, but always ends up being vocalised once I get engrossed. I need the words to make my intentions concrete - a little compensation for executive functioning problems, I guess. It did used to drive some of my colleagues potty having me sat there all day announcing the purpose of every little mouse-click - especially as I tend to talk to software as if it is a naughty toddler most of the time!
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