Political opinions are considered choices, and in Western democracies the right to choose one’s opinions — freedom of conscience — is considered sacrosanct.

But recent studies suggest that our brains and genes may be a major determining factor in the views we hold.

A study at University College London in the UK has found that conservatives’ brains have larger amygdalas than the brains of liberals. Amygdalas are responsible for fear and other “primitive” emotions. At the same time, conservatives’ brains were also found to have a smaller anterior cingulate — the part of the brain responsible for courage and optimism.

If the study is confirmed, it could give us the first medical explanation for why conservatives tend to be more receptive to threats of terrorism, for example, than liberals. And it may help to explain why conservatives like to plan based on the worst-case scenario, while liberals tend towards rosier outlooks.

“It is very significant because it does suggest there is something about political attitudes that are either encoded in our brain structure through our experience or that our brain structure in some way determines or results in our political attitudes,” Geraint Rees, the neurologist who carried out the study, told the media.

Rees, who heads up UCL’s Institute of Cognitive Neuroscience, was originally asked half-jokingly to study the differences between liberal and conservative brains for an episode of BBC 4’s Today show that was hosted by actor Colin Firth. But, after studying 90 UCL students and two British parliamentarians, the neurologist was shocked to discover a clear correlation between the size of certain brain parts and political views.

He cautions that, because the study was carried out only on adults, there is no way to tell what came first — the brain differences or the political opinions.

But evidence is beginning to accumulate that figuring out a person’s political proclivities may soon be as simple as a brain scan — or a DNA test.

In a study published in October, researchers at Harvard and UC-San Diego found that a variant of the DRD4 gene predisposes people to being liberal, but only if they had active social lives as adolescents. The “liberal gene” has also been linked to a desire to try new things, and other “personality traits related to political liberalism.”

For his part, actor Colin Firth, who hosted the BBC show that revealed the results of the brain scans, has said he wants to see brain scans on politicians to find out if they are telling the truth about what they believe.

Questioning the “liberal” credentials of the head of Britain’s Liberal Democratic party, Nick Clegg, Firth said: “I think we should have him scanned.”

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