Editing Triune brain (section)

==Aspects==
===Reptilian complex===
"Reptilian complex" (also known as the "R-complex", "reptilian brain" or "lizard brain") was the name MacLean gave to the [[basal ganglia]], structures derived from the floor of the forebrain during development. The term derives from the idea that comparative neuroanatomists once believed that the forebrains of reptiles and birds were dominated by these structures. MacLean proposed that the reptilian complex was responsible for species-typical instinctual behaviours involved in aggression, dominance, territoriality, and ritual displays.<ref>{{cite book |last1=Sax |first1=Boria |title=Lizard |date=15 October 2017 |publisher=Reaktion Books |isbn=978-1-78023-872-2 |url=https://books.google.com/books?id=eBBeDwAAQBAJ&pg=PT55 |access-date=9 June 2020}}</ref>
===Paleomammalian complex===
This consists of the [[septum]], [[amygdalae]], [[hypothalamus]], [[hippocampus|hippocampal complex]], and [[cingulate cortex]]. MacLean first introduced the term "[[limbic system]]" to refer to this set of interconnected brain structures in a paper in 1952. MacLean's recognition of the limbic system as a major functional system in the brain was widely accepted among neuroscientists, and is generally regarded as his most important contribution to the field. MacLean maintained that the structures of the limbic system arose early in mammalian evolution (hence "paleomammalian", with ''[[wikt:paleo-|paleo-]]'' meaning ''old'') and were responsible for the motivation and emotion involved in feeding, reproductive behaviour, and parental behaviour.  {{Citation needed|date=September 2017}}
===Neomammalian complex===
This consists of the cerebral [[neocortex]], a structure found uniquely in higher mammals, and especially humans. MacLean regarded its addition as the most recent step in the evolution of the mammalian brain, conferring the ability for language, abstraction, planning, and perception. {{Citation needed|date=September 2017}}