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Educational illustration of a human brain split into the reptilian brain, limbic system, and neocortex, with labels.

Educational illustration of a human brain split into the reptilian brain, limbic system, and neocortex, with labels.

I want to create an image of the three brains that we have, in a simpler way. I would like to have the image of the brain, with the split of these three brains. To help you understand, below the Overview of the Three Brains. The concept of the three brains originates from Paul D. MacLean’s triune brain theory, which proposes that the human brain evolved in layers over millions of years. According to this model, the brain consists of: Reptilian brain (basal ganglia): The most primitive layer, responsible for survival instincts such as aggression, territoriality, and reproduction Limbic system (paleomammalian brain): The emotional center, governing feelings, social bonding, and memory Neocortex (neomammalian brain): The newest layer, enabling rational thought, planning, language, and abstract reasoning psychologyfor.com psychologyfor.com +2 . This model explains why humans often experience conflicting impulses: instinctual drives, emotional responses, and logical reasoning can operate simultaneously and sometimes in opposition psychologyfor.com psychologyfor.com +1 . See more