reptilian brain
Physiology
noun
(In some models of human brain evolution and function) the brain stem and cerebellum, understood as a phylogenetically ancient unit whose functions largely correspond to those of the brains of reptiles; (hence in popular culture) that part of the brain or personality responsible for visceral reactions and primitive drives.
- In popular sources the function of this part of the brain is often partly confused with that of the limbic system..
Origin
1960s.