Biology and political orientation
A number of studies have found that human biology can be linked with political orientation. This means that an individual's biology may predispose them to a particular political orientation and ideology. Many of the studies linking biology to politics remain controversial and unrepeated, although the overall body of evidence is growing.
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Studies have found that subjects with conservative political views have larger amygdalae and are more prone to feeling disgust. Liberals have larger volume of grey matter in the anterior cingulate cortex and are better at detecting errors in recurring patterns. Conservatives have a stronger sympathetic nervous system response to threatening images and are more likely to interpret ambiguous facial expressions as threatening. In general, conservatives are more likely to report larger social networks, more happiness and better self-esteem than liberals. Liberals are more likely to report greater emotional distress, relationship dissatisfaction and experiential hardship and are more open to experience and tolerate uncertainty and disorder better.
Genetic factors account for at least some of the variation of political views. From the perspective of evolutionary psychology, conflicts regarding redistribution of wealth may have been common in the ancestral environment and humans may have developed psychological mechanisms for judging their own chances of succeeding in such conflicts. These mechanisms affect political views.