The parts of the brain according to Paul MacLean are the reptilian brain, the limbic brain and the neocortex (or neocortex).
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Neuroscience
Human brain
The triune brain is a model of the evolution of the vertebrate forebrain and behavior, proposed by the American physician and neuroscientist Paul D. MacLean. MacLean originally formulated his model in the 1960s and propounded it at length in his 1990 book The Triune Brain in Evolution.Wikipedia
The parts of the brain according to Paul MacLean are the reptilian brain, the limbic brain and the neocortex (or neocortex).