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I don't know about self esteem but I will give you this if you haven't bumped into it already....
What It Means
There is a big unknown underlying these findings. Supposing that the size of one's amygdala really does increase the likelihood of being a conservative. Is the size of the amygdala determined at birth, or does it perhaps increase with frightening childhood experiences, such as authoritarian parenting and corporal punishment?
Similarly, one might ask whether the gray matter difference is affected by exposure to educational challenge, social diversity, or childhood cognitive enrichment.
The born versus acquired perspective on political attitudes is important to psychologists. After all, if political proclivities are fixed at birth in terms of brain anatomy, there is little hope of change. Most of us would probably like to see a world in which political attitudes were less polarized, and more changeable, but that may be a pipe dream.
Meanwhile, the neuro-scientific fact of two very different political creatures helps clarify much of the political antics of modern democracies.