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The triune is a model of the brain focuses on the recognizable differences between most reptiles, early mammals, and late mammals. The theory recognizes three major evolutionary periods in the development of the brain that are characterized by three recognizably distinct ways of solving adaptive challenges. Under this model, the “neocortex” represents that cluster of brain structures involved in advanced cognition, including planning, modeling and simulation; the “reptilian brain” refers to those brain structures related to territoriality, ritual behavior, and other “reptile” behaviors; and “limbic brain” refers those brain structures, wherever located, associated with social and nurturing behaviors, mutual reciprocity, and other behaviors and affects that arose during the age of the mammals.