Humans in general have a seven second window of self-consciousness. (What is the reference for this? Double check it.) The exception is when one is in conversation with someone else, and then people have much longer spans of self-consciousness.
I'm left to wonder if this is a useful fact for writing in the margins in books or into one's notebook, commonplace book, or zettelkasten? By having a conversation with yourself, or more specifically with the imaginary author you're annotating or if you prefer to frame it as a conversation with your zettelkasten, one expands their self-consciousness for much longer periods of time? What benefit does this have for the individual? What benefit for humanity in aggregate?
Is it this fact or just coincidence that much early philosophy was done as dialectic?
From an orality perspective, this makes it much more useful to talk to one's surroundings or objects like rocks. Did mnemonic techniques help give rise to our ability to be more self-conscious as a species? Is it like a muscle that we've been slowly and evolutionarily exercising for 250,000 years?