The Triune Brain: Understanding the Evolution of Human Behavior

Namaste, Yogi! Have you ever wondered why teenagers sometimes exhibit erratic behavior or why adults generally have a more mature perspective on life and social interactions? The explanation lies in the structure of the brain, which is divided into three distinct parts: the reptilian brain, the mammalian brain, and the neocortex. 1. The Reptilian Brain The reptilian brain, also known as the basal ganglia, is the oldest part of the brain in evolutionary terms. It governs our primal instincts and behaviors, particularly those related to survival. This part of the brain is responsible for the fight-or-flight response, regulating basic functions such as aggression, dominance, territoriality, and survival instincts. 2. The Mammalian Brain The mammalian brain, or the limbic system, sits above the reptilian brain and is responsible for emotions and memories. It processes a wide range of emotions and is key to forming and recalling memories. This part of the brain allows us to e