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POPSPolitical Junkies: Why it Feels Good to Be an Extremist In The Political Brain , psychologist Drew Western summarizes fMRI experiments exploring the neuro-psychology of systematic bias and rationalization in the brains of political extremists. Finding ways to dismiss contradictory evidence triggers pleasant emotional releases in partisans' brains, eventually becoming a pleasurable, learned behavior. Once partisans had found a way to reason to false conclusions, not only did neural circuits involved in negative emotions turn off, but circuits involved in positive emotions turned on. The partisan brain didn't seem satisfied in just feeling better. It worked overtime to feel good, activating reward circuits that give partisans a jolt of positive reinforcement for their biased "reasoning." These reward circuits overlap substantially with those activated when drug addicts get their "fix," giving new meaning to the term political junkie.