I'm not 100% sure what the OP intended but there are more generous interpretations: Many people call [the limbic system] the "Lizard Brain,” because the limbic

I'm not 100% sure what the OP intended but there are more generous interpretations: Many people call [the limbic system] the "Lizard Brain,” because the limbic system is about all a lizard has for brain function. It is in charge of fight, flight, feeding, fear, freezing up, and fornication. https://www.psychologytoday.com/us/blog/where-addiction-meets-your-brain/201404/your-lizard-brain https://www.psychologytoday.com/us/blog/where-addiction-meet...