The “triune brain”
This myth is the idea that the human brain evolved in three layers.
- The deepest layer is known as the lizard brain and said to house our instincts.
- The middle layer - the limbic system - allegedly contains emotions inherited from ancient mammals.
- The topmost layer, named the neocortex, is uniquely human and supposedly lets us regulate our brutish emotions and instincts.
Modern research has revealed that the brain doesn't evolve in layers but is built from a manufacturing plan using the same neurons.
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