The triune brain model was developed by neuroscientist Paul MacLean in the 1960s. Neuroscience has progressed over the last 60 years and parts of his theory have since been invalidated. But the triune brain model is simple and useful enough for a layman to gain some understanding about how our brains work. The triune brain has 3 parts: the reptilian brain is in charge of our survival instinct,the mammalian brain handles our emotions, andthe neocortex helps us analyse with logic. Triune brain: Reptilian complex (basal ganglia for instinctual behaviours), mammalian brain (septum, amygdalae, hypothalamus, hippocamp for feeling) and Neocortex (cognition, language, sensory perception, and spatial reasoning). Reptilian brain The so-called survival instinct is associated with this brain. The reptilian brain has helped our ancestors survived their environment. Facing a danger, be it a tiger or a human assailant, the brain would signal to the heart to pump more blood,...