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Well, perhaps sadly, I maintain trains of thought unrelated to my environment all the time. It's because the default state of the world is so incredibly.. bland I really, really cannot take it without something going on.

Well, FWIW, I can easily write and count. It's actually way easier than I thought and takes no effort. Perhaps due to automatic touch typing while talking and thinking about something else etc? I can actually type and think about something else, never really noticed that before.

Reading and counting is harder for me. I can do it, but it's tiring. Those feel like they share lanes to me.

Not at all. I can do it, but I have to actively produce it. Don't see much use for it except when reading quality fiction. It's dog slow IME. You are a fast reader?

You might wonder how I read and it's a bit like how you can watch an intersection and know what to do without verbalizing "there is a bike", "there is a car". You just get the situation and understand it. Sentences are like that as well.

It reminds a bit of musicians tracking rhythm. You can somehow feel a beat after a bit practice even when not directly paying attention to it and it's not too hard to associate it with an increasing counter (somehow). It sounds hard, but it is quite doable.