The Genetics of Political Behavior: How Evolutionary Psychology Explains Ideology

In this unique amalgam of neuroscience, genetics, and evolutionary psychology, Ryan argues that leftists and rightists are biologically distinct versions of the human species that came into being at different moments in human evolution.

The book argues that the varying requirements of survival at different points in history explain why leftists and rightists have anatomically different brains as well as radically distinct behavioral traits. Rightist traits such as callousness and fearfulness...