The amygdala is central to processing fear, anxiety, and aggression.

“amygdala is like one of the the anchors of what's called the limbic system in the brain limbic system it's the part of the brain that's all about emotion not surprisingly mammals have a whole lot more limbic development than fish dude Fisher are not famous for their emotional lives the limbic system is arousal fee or anger lust love maternal pair-bonding mother infant bonding all of that and it's a whole series of structures not surprisingly ancient in mammals not surprisingly highly complex interconnected not surprisingly sitting underneath the cortex the cortex that more recently evolved part of the brain that does your taxes all of that limbic system underneath there all this subterranean emotion stuff and amygdala is one of the limbic structures and it's involved in fear it's involved in anxiety it's involved in aggression”