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How you react physically to stimuli can have a great deal of impact on how you perceive the world and therefore how you vote, according to a recent study by researchers at the University of Nebraska-Lincoln (UNL).

For example, people who react more strongly to bumps in the night, spiders on a human body or the sight of a shell-shocked victim are more likely to support public policies that emphasize protecting society over preserving individual privacy. The research results appear in the Sept. 19 issue of Science magazine.

The study tested 46 people who identified themselves as having strong political opinions. Researchers showed subjects threatening visual images--pictures of a spider on a person's eyeball, a dazed person with a bloody face and an open wound with maggots in it--and monitored their skin for electrical conductivity, which indicates emotion, arousal and attention. In another physiological measure, the scientists surprised subjects with a sudden, jarring noise and measured how hard they blinked in response to being startled.

"Those with the strongest eye or skin reactions to unexpected noises or threatening pictures such as a spider on a person's eyeball tended to endorse political positions that were interpreted as protective of social groups," said John Hibbing, professor of political science at UNL.

Hibbing defined those "protective policies" as more defense spending, more government resources directed at fighting terrorism and tighter controls on immigration. "People in this group are more willing to sacrifice a little of their privacy to protect the social unit," Hibbing said. "On the other hand, the subjects who reacted less strongly to the stimuli were more likely to favor policies that protect privacy and encourage gun control."

The first group believes the greatest threat to them and their communities comes from other people; they want to arm themselves and their government to defend against those threats. The latter group sees less threat from people and more threat from technology and inanimate objects such as guns that can kill or harm innocent people. They want policies in place to protect their individual privacy and safety: They oppose the death penalty and favor strong gun control. The study controlled for subjects' gender, age and income.

NSF Program Officer Brian Humes said the Political Science Program at NSF sees this work as an important project that begins to link the sources of political preferences to biological mechanisms. "It also does so in a nuanced sense by stressing both the importance of environment and genetics," Humes said. "This linkage is one that could easily transform the manner in which political scientists and social scientists see the origins of preferences."

According to Hibbing, these research results may help explain why various political groupings often have trouble talking to each other about protective policies. "Maybe liberals and conservatives have difficulty understanding the views of the other side in part because they experience threats differently," he said. "Perhaps by recognizing these differences, tolerance of diverse political opinions could be facilitated."

In spite of these results, Hibbing stressed that a genetic predisposition to disturbing sounds and images is only one factor in determining an individual's political beliefs. Other factors such as environment and life experiences obviously play a part. "We're just talking about tendencies, it's far from determinative, but the fact that we can measure a difference at all is surprising and intriguing enough to warrant more study."