Yep, there are several studies researching this in various ways. An important thing to point out is that those two portions of the brains are inversely correlated without affecting other portions of the brain like the frontal cortex. So a person can be a good doctor or scientist and also be conservative. So conservatives have high fear responses to people who are different and lack empathy while left leaning people have less fear and increased empathy. Studies also show that brains develop to have an oversized amygdala when they have physical or emotional abuse as growing up or if they have severe lack of resources.