Trying to figure out how to best word my question... I study plant behavior (really, the study is called "plant neurobiology" but in order to keep this comment on topic, let's just talk about behavior.

From my somewhat limited research, it seems like there is still a pretty strong focus on human behavior being localized to the brain, even in the face of examples where people have lost large chunks of brain and still been able to operate functions once thought to be found there. My question is if there is a branch of human behavior that believes that it is not localized to the brain? If so, what would it be called? Thanks!