The Triune Brain is a hypothesis proposed by Paul D. MacLean about the traces of evolution existing in the structure of the human brain. The hypothesis conceives the brain as a system consisting of three subsystems, all of which originated from separate points of evolutionary history. The systems are therefore not in a state of perfect equilibrium, since they actually are three relatively independent systems constituting a bigger one.
The three systems are, in chronological order:
- The R-complex
- The Limbic system
- The Neocortex
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