I'm just a lay person on this topic, but their sense of self is largely unaffected, it's mostly that they react independently when it comes to stimuli. One wonders if that sense of self starts to diverge the longer it's been since the operation. I suspect if you kept the hemisphere's visually isolated, so that each hemisphere saw something different then they definitely would develop different personalities over time.
If you move from severing to actual damage then you get all sorts of crazy effects, particularly if it's right hemisphere damage. For example:
What do the people who have their brains severed say, write, paint, and otherwise communicate about who they are?
I'm just a lay person on this topic, but their sense of self is largely unaffected, it's mostly that they react independently when it comes to stimuli. One wonders if that sense of self starts to diverge the longer it's been since the operation. I suspect if you kept the hemisphere's visually isolated, so that each hemisphere saw something different then they definitely would develop different personalities over time.
If you move from severing to actual damage then you get all sorts of crazy effects, particularly if it's right hemisphere damage. For example:
https://en.wikipedia.org/wiki/Somatoparaphrenia