As the right hemisphere is dominant for emotion processing, the left cheek expresses emotion more intensely than the right cheek. This prompts a leftward bias: people offer the left cheek to communicate emotion and viewers perceive left cheek poses as more emotive. Perceptions of trustworthiness are positively influenced by emotional expressivity, with smiling faces deemed more trustworthy than neutral faces. Thus as the left hemiface is more emotionally expressive than the right, the present study sought to determine whether people offer the left cheek to communicate trustworthiness, and the right to express untrustworthiness. One hundred and twenty-six participants (57 males, 69 females) completed a posing task asking them to read one of two scenarios (randomly assigned: trusted babysitter; untrustworthy car salesman), consider it for 30 seconds, and then pose for a photograph communicating their trustworthiness or untrustworthiness. Contrary to expectation, binary logistic regression results indicated no posing bias for communicating trustworthiness, however people were more likely to offer the left than right cheek when posing to communicate untrustworthiness. The novel finding of a left cheek bias for untrustworthiness is previously unreported, and highlights the need for future investigations of trustworthiness to examine both sides of the trustworthy coin.

中文翻译：

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面对事实：在可信赖度的沟通中是否存在面相差异？

由于右半球在情感处理中占主导地位，因此左脸颊比右脸颊更能表达情感。这会引起向左偏见：人们提供左脸颊来传达情感，而观众则认为左脸颊姿势更具有情感。信任感受到情感表达能力的积极影响，笑脸比中性脸更值得信赖。因此，由于左半脸比右半脸在情感上更具表现力，因此本研究试图确定人们是否提供左脸颊来传达可信赖性，以及表达不信任的权利。126位参与者（57位男性，69位女性）完成了摆姿势的任务，要求他们阅读以下两种情况之一（随机分配：值得信赖的保姆；不可靠的汽车推销员），思考30秒，然后摆出一张照片，传达他们的可信赖性或不可信赖性。与预期相反，二元逻辑回归分析结果表明，在传达可信赖性方面没有构成偏见，但是人们在摆姿势传达不可信赖性时更倾向于提供左颊而不是右颊。以前从未报道过发现不信任的左脸偏见的新颖发现，并突出显示了需要对未来的信任进行调查以检查可信任硬币的两面的问题。