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Reptilian complex

The triune brain was a once popular model of the evolution of the vertebrateforebrain and behavior, proposed by the American physician and neuroscientistPaul D. MacLean in the 1960s. The triune brain consists of the reptilian complex (basal ganglia), the paleomammalian complex (limbic system), and the neomammalian complex (neocortex), viewed each as independently conscious, and as structures sequentially added to the forebrain in the course of evolution.

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