Monkeys Predict US Elections

Yaoguang Jiang, Annamarie Huttunen, Naz Belkaya, Michael Platt
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Abstract

How people vote often defies rational explanation. Physical traits sometimes sway voters more than policies do. But why? Here we show that rhesus macaques, who have no knowledge about political candidates or their policies, implicitly predict the outcomes of US gubernatorial and senatorial elections based solely on visual features. Given a pair of candidate photos, monkeys spent more time looking at the loser than the winner, and this gaze bias predicted not only binary election outcomes but also vote share. Analysis of facial features revealed candidates with more masculine faces were more likely to win an election, and vote share was a linear function of jaw prominence. Our findings endorse the idea that voters spontaneously respond to evolutionarily conserved visual cues to physical prowess and that voting behavior is shaped, in part, by ancestral adaptations shared with nonhuman primates.
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猴子预测美国大选
人们如何投票往往无法用理性来解释。身体特征有时比政策更能左右选民。但为什么会这样呢?在这里,我们展示了对政治候选人或其政策一无所知的猕猴仅根据视觉特征就能隐性地预测美国州长和参议员选举的结果。在给定一对候选人照片的情况下,猕猴看落选者的时间多于看获胜者的时间,这种注视偏差不仅能预测二元选举结果,还能预测得票率。对脸部特征的分析表明,脸部更阳刚的候选人更有可能赢得选举,而得票率则是下颌突出度的线性函数。我们的研究结果证实了这样一种观点,即投票者会自发地对进化过程中保留下来的有关身体优势的视觉线索做出反应,投票行为部分是由与非人灵长类动物共享的祖先适应性形成的。
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