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This is Scientific American 60-Second Science. I'm Diana Kwon. Got a minute?

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JFK audio

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What makes a successful politician?Experience? Skill? Charisma?

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Perhaps you were searching for these traits while watching the recent Republican presidential debate.

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But what you might not have thought about was how your perception of the candidates could be influenced by their voices.

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Chris Christie audio

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In two recently published studies, researchers looked at how the pitch of a candidate's voice affected their chances in an election.

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The first study found that in the 2012 U.S.House elections candidates with lower voices were more likely than a higher-pitched opponent to win.

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With one exception: when running against a female opponent, candidates with higher voices were more popular, especially if they were men.

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That study is in the journal Political Psychology.

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In the second study, researchers wanted to know why a deep voice was a potent political tool.

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They recorded men and women speaking the sentence "I urge you to vote for me this November."

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They then altered the recordings to create higher and lower pitched versions of each sentence.

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More than 800 volunteers listened to the audio.

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Their preference for lower-pitched voices correlated with their preconception that these individuals were older, stronger and more competent.

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This study is in the journal PLoS ONE.

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The researchers note that a preference for leaders with deeper voices may be the result of so-called "cavemen instincts."

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A deep voice is associated with high testosterone, physical strength and aggression.

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And way back when, those qualities were probably attractive in a leader.

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High-pitched voices also are thought to convey negative emotions, such as stress and fear.

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We like to think that we consider our electoral options carefully, and base our decisions on conscious, rational judgments.

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But it may be a candidate's height, attractiveness or voice that play outsized roles when we go to the polls.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Diana Kwon.

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