There are actually physiological differences in brain structure between conservatives and liberals. That’s not to say that one group is necessarily smarter than the other. Liberals have more tolerance to uncertainty. Compared with liberals, conservatives tend to have stronger physiological responses to negative environmental stimuli.
How Are the Brains of Liberals and Conservatives Different?
https://amarkfoundation.org/reports/how-are-the-brains-of-liberals-and-conservatives-different/
Liberals tend to be collectivists, whereas Conservatives tend to be individualists.