Neuroscience model describes three distinct brain layers in human skulls
A 1959 neuroscience theory proposed that humans possess three layered brains responsible for survival, emotion, and higher thought.
The primitive inner layer
In 1959 Paul D MacLean introduced a model describing the brain as three distinct layers. The deepest section is called the lizard brain and contains regions for survival tasks like hunting and foraging. This ancient part also drives sexual impulses to ensure reproduction.
The emotional middle layer
A second layer wraps around the first and is known as the mammalian brain. It houses the limbic system which scientists deem the seat of human emotions. This structure allowed mammals to play, care for young, and communicate crudely.
The outer rational layer
The third and final layer sheathes all previous sections while making humans unique. Although the source text cuts off before finishing this description, it implies this top layer handles complex functions. The model suggests these three parts fight to generate feelings and thoughts.
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