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Paul MacLean, one of the distinguished behavioral scientists of our time, in this series of essays, joins Plato, Freud, and Magoun in seeing man's brain as three layered. MacLean's choices are reptilian, limbic, and neocortical. Paul MacLean's special contribution, of course, harks back to his clairvoyant recognition of the limbic system and its very great importance in mediating the emotions and integrating them with all other forms of behavior. For those unfamiliar with his many studies in this and related areas, these lectures will serve as an excellent introduction.
Plum F. A Triune Concept of the Brain and Behaviour (Hincks Memorial Lectures).. Arch Neurol. 1974;30(3):272. doi:10.1001/archneur.1974.00490330080016
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