Scientists found that those with conservative views have brains with larger amygdala's, almond shaped areas in the centre of the brain often associated with anxiety and emotions.
On the otherhand, they have a smaller anterior cingulate, an area at the front of the brain associated with courage and looking on the bright side of life.
"Previously, some psychological traits were known to be predictive of an individuals's political orientation, " said Dr Ryota Kanai, lead author.
"Our study now links such personalty traits with specific brain structure."
The study appeared to back up many prior psychological reports showing that conservatives are more sensitive to threat and anxiety in the face of uncertainty, while liberals tend to be more open to new experiences.
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