Brain transplants would be inherently different from heart or kidney transplants. Nagel does not answer this question. Brain emispheres cannot compete, even when they have been separated. They have been programmed to work in tandem. Neal's semantic theory is based on Bertrand Russell's theory of descriptions.
Cognition is defined as the skill of dealing with knowledge.
Such knowledge comes from the environment. Rather than trying to understand which information the mind can process, attention should be paid to which information is available in the environment. The mind developed to cope with that information. Neisser, in partial agreement with Gibson, presents an alternative approach to perception which is based on an ecological orientation. Organisms pick up information from the environment.