Would this presume that it could be found with surgery?
Yes, and I would say it has been found with surgery, to some degree. Back in the 40's and 50's, lobotomies were
a popular option for patients with severe forms of epilepsy and other conditions. As I'm sure you know, they stuck
an 'ice pick' through one's sinuses and up into the prefrontal cortex and basically egg-beatered the brain tissue just behind
the forehead. And those patients reported loss of 'agency', which means they didn't have a sense of self.
So we do know where the 'self' resides in the brain. Thank God we don't allow such brutal surgeries any more.
Yes, absolutely. And I know it's claimed that some people (Jiddu Krishnamurti being one) never developed a sense of Self in childhood. So maybe genetics has something to do with it.Yes, i believe this to be so. ..and that your sense of self is the result of training. Would it be different if you were raised by wolves (or in a different country with different parents?)
Another question that interests me is, why did the sense of self evolve in the first place? Why is it here, since it causes so many problems for us? And it seems to me it might have to do with survival. Nature may have found that entities that believed themselves separate from the rest of Life may have worked harder to compete for resources like food, and therefore had a better chance of passing on their genes.

