>>37052527NTA but I beg to differ, if we could consider those factors as "external factors" and only modify "the surface" of your personality, then, in my personal opinion, your isolated brain would and can be considered you almost perfectly.
Besides, there're a lot of people that consider their own definitions of themselves as something loose and vague, fluid even.
So in my opinion, my brain (and my memories) would be enough to be considered "me".