Psychological science is currently in conceptual disarray, characterized by unconnected mini-theories and isolated empirical findings. We lack a theory of the functional properties of the human mind that could provide the needed integration—a theory about what the mechanisms of mind are "designed" to do. Evolutionary psychology provides the conceptual tools for emerging from this fragmented state. In this target article, I outline the fundamental premises of evolutionary psychology; illustrate the application of evolutionary psychology to domains such as reasoning, social exchange, language, aggression, jealousy, sex, and status; and then consider the implications of evolutionary psychology for the key branches of social, personality, developmental, and cognitive psychology and suggest ways in which these disciplinary boundaries can be transcended. I conclude by looking at the emergence of evolutionary psychology as our field matures into the 21st century.
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