Evidence suggests that these personality differences between liberals and conservatives begin to emerge at an early age. A 20-year longitudinal study by Jack and Jeanne Block showed that those who grew up to be liberals were originally assessed by their preschool teachers as more emotionally expressive, gregarious, and impulsive when compared to those who became conservatives, who were considered more inhibited, uncertain, and controlled. Liberals may show greater tolerance for diversity and creativity, but they may also be more impulsive, indecisive, and irresponsible. On the flip side, conservatives may be organized, stable, and thrifty, but also have stronger just-world beliefs (leading to a greater tolerance for inequality), and stronger fears of mortality and ambiguity. Even recent neuroscience work published in Current Biology from University College London identifies fundamental differences in the partisan brain. Brain scans revealed a larger amygdala in self-identified conservatives and a larger anterior cingulate cortex in liberals, leading the researchers to conclude that conservatives may be more acute at detecting threats around them, whereas liberals may be more adept at handling conflicting information and uncertainty.
Some evidence suggests, however, that we aren’t always so divided.