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It is a curious thing about the philosophy of mind, that it includes surprisingly little about minds. In an average anthology on the subject, or a book like Ryle's, one finds discussions of thinking, imagining, believing, willing, remembering, and so on, but not of minds. It seems to be assumed that investigating these topics is investigating minds; but whether that is true is not itself made a topic for investigation.
John F. Hunter (Wed,) studied this question.