Note to self: This bias may not be uniquely American. A 2016 study confirms that our political beliefs are the ones most resistant to change in spite of new information that refutes them. It's called Neural Correlates of maintaining one's political beliefs in the face of couterevidence.
WHAT MAKES US RESISTANT TO NEW IDEAS 2016
Neural correlates of maintaining one’s political beliefs in the face of counterevidence
Jonas T. Kaplan, Sarah I. Gimbel & Sam Harris
Scientific Reports 6, Article number: 39589 (2016)
23 December 2016
People often discount evidence that contradicts their firmly held beliefs. However, little is known about the neural mechanisms that govern this behavior. We used neuroimaging to investigate the neural systems involved in maintaining belief in the face of counterevidence, presenting 40 liberals with arguments that contradicted their strongly held political and non-political views. Challenges to political beliefs produced increased activity in the default mode network—a set of interconnected structures associated with self-representation and disengagement from the external world. Trials with greater belief resistance showed increased response in the dorsomedial prefrontal cortex and decreased activity in the orbitofrontal cortex. We also found that participants who changed their minds more showed less BOLD signal in the insula and the amygdala when evaluating counterevidence. These results highlight the role of emotion in belief-change resistance and offer insight into the neural systems involved in belief maintenance, motivated reasoning, and related phenomena.