||This powerfully iconoclastic book reconsiders the influential nativist position toward the mind. Nativists assert that some concepts, beliefs, or capacities are innate or inborn: "native" to the mind rather than acquired. Fiona Cowie argues that this view is mistaken, demonstrating that nativism is an unstable amalgam of two quite different -- and probably inconsistent -- theses about the mind. Marshaling recent empirical evidence from developmental psychology, psycholinguistics, computer science, and linguistics, she provides a crisp and timely critique of Chomsky's nativism and defends in its place a moderately nativist approach to language acquisition. She also takes on the view articulated by philosopher Jerry Fodor and other influential nativists that learning, particularly concept acquisition, is a mysterious process. Cowie challenges this explanatory pessimism, and argues convincingly that concept acquisition is psychologically explicable. What's Within? is a clear and provocative achievement in the study of the human mind.