I don't mean from a hippy-dippy-trippy spiritualism perspective. I mean, from a cognitive neuroscience perspective: what is a self? I don't think we can find a part of the brain that's responsible for it, so it must be a construct, indistinguishable from self-concept. Moreover, Kahneman's work suggests that there are multiple "selves" with different agendas. If so, what does that imply about identity, agency, responsibility, etc.?