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I've noticed that when reading articles, stories, etc. online I'll highlight paragraphs of text. I do it in the periphery of my vision - sometimes below and sometimes above the paragraph I'm currently reading. I'll highlight the entire paragraph, though sometimes I'll highlight from the second word to the penultimate word in the second and penultimate lines (respectively) inside of that paragraph.

I don't know why I do it; I just know that I've done it for a VERY long time. Perhaps it's keeping me aware of the exact location of my cursor.

I don't know.

I just do it.