The Triune Brain Theory

The triune brain theory, proposed by neuroscientist Paul MacLean, suggests that the human brain has three distinct layers developed over time: the reptilian brain (responsible for basic survival instincts), the limbic system (associated with emotions and social behaviors), and the neocortex (involved in higher-order thinking, reasoning, and complex decision-making). This model highlights how our brain's evolution reflects our development as a species, influencing how we respond to situations—from basic survival behaviors to advanced cognitive functions. Understanding this framework can help us appreciate the complexity of human behavior and the interplay between our emotional and rational responses.