Could internal monologue a vestige of bicameralism?
>Bicameralism[Note 1] (the condition of being divided into "two-chambers") is a hypothesis in psychology that argues that the human mind once operated in a state in which cognitive functions were divided between one part of the brain which appears to be "speaking", and a second part which listens and obeys—a bicameral mind.[0]
Weirdly, I think that his theory makes sense without leaning on bicameralism at all. Internal monologues could be a recent development with very few obvious physical changes in the brain that caused it, and the cultural interpretation of it could have changed.
People think of the idea of 'the mind' and 'the self' being obvious and self evident, but they are anything but, and it took a lot of brilliant philosophers and poets to come up with words to talk about it and metaphors to use. It seems completely believable to me that bronze age people did not have a clear understanding of what thought was and what was doing the thinking.
My opinion is that the "internal talk" is a result of our adaptation to human culture from the last thousands of years. This happens because several thousand years ago we had no language, at least not as developed as in the modern world. I guess the same is true for hearing music inside your mind, since there was no music (as we understand nowadays) a few thousand years ago.
>Bicameralism[Note 1] (the condition of being divided into "two-chambers") is a hypothesis in psychology that argues that the human mind once operated in a state in which cognitive functions were divided between one part of the brain which appears to be "speaking", and a second part which listens and obeys—a bicameral mind.[0]
0.https://en.wikipedia.org/wiki/Bicameralism_(psychology)