This little feature is constantly scanning for novelty in your environment that might pose a threat or offer a reward. Inside the reptilian region is a critical piece of brain hardware called the Reticular Activating System (RAS). Its job is to keep you alive, and to that end it controls breathing, heart rate, body temp, blood pressure, and a few other things that will either send you running (if it senses danger) or help you relax. This is the part of the brain that startles at unfamiliar noises or wakes you to the smell of smoke. Sometimes called the “lizard brain, ” this region doesn’t think: it only reacts. They are symbiotic and synchronized in their functions - communicating with each other and with the nervous system to help us decide how to respond in any given situation. The structures developed in three layers, from the bottom up, and each is powerful in its own way. These structures sort and store information through experiences and then apply it when necessary to ensure our survival. The brain, like a computer, has certain in-built structures - its hardware, if you will. This one is going to be technical, so hang on.
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