<b>Dyadic Person Similarity Predicts Similarity in Face Judgments</b>

Here we share our data and code for our project <b>Dyadic Person Similarity Predicts Similarity in Face Judgments.</b>Research shows that perceivers consistently extract information from faces to judge whether others are attractive, trustworthy, or dominant. However, there is also substantial variability among perceivers when making these social judgements. We seem to use our own dispositions as frameworks for making judgements about others, so could it be that two people who are similar in their dispositions also tend to make more similar social judgements? A consistent understanding of others may serve as a foundation for our social relationships, be it platonic or romantic. The present study investigated whether dyadic similarities in participants’ own dispositions are related to similarities in their social face judgements. 307 participants based in the UK rated 24 faces on six social traits. Participants also rated themselves on 13 social traits and completed a 60-item personality questionnaire. We computed dissimilarities between pairs of participants for face judgements, self-perceived trait ratings, and personality ratings, resulting in three separate dissimilarity matrices. Each entry in each matrix depicted pairwise distances in ratings between participants. Using representational similarity analysis, the three matrices were then correlated with each other. Results showed that both the self-perceived trait and personality matrices were significantly correlated with the face judgement matrix respectively. These results indicate that participants with more similar personalities and social trait dispositions were more likely to make similar social face judgements. Importantly, these associations were stable even when controlling for age, gender, ethnicity, and geographical location<i>. </i>These findings show that people who are more similar to each other also perceive the world in a similar manner and may form the basis for how we gravitate towards others, build connections and form relationships.The study was approved by the Psychology Research Ethics Committee at City, University of London.We pre-registered our study, specifying sample size, inclusion, and exclusion criteria (https://doi.org/10.17605/OSF.IO/ZR92G).Here we share the raw anonymised data and the code we used for main analyses. The README file explains the folder contents, including what each script does. Raw data consists of csv files for each participant. Code runs in MATLAB.<br><b>二元个体相似性预测面部判断的相似性</b> 在此，我们分享本项目的数据与代码。研究表明，感知者会持续从面部提取信息，以判断他人是否具有吸引力、值得信赖或具备支配力。然而，感知者在做出这些社会判断时也存在显著的个体差异。我们似乎会将自身的性格倾向作为判断他人的框架，那么性格倾向相似的两个人是否也更倾向于做出相似的社会判断呢？对他人的一致理解可能是我们社会关系（无论是柏拉图式友谊还是浪漫关系）的基础。本研究探讨了参与者自身性格倾向的二元相似性是否与他们社会面部判断的相似性相关。307名英国参与者对24张面部图片的6项社会特质进行了评分，同时对自身的13项社会特质进行自评，并完成了一份60题的人格问卷。我们计算了参与者两两之间在面部判断、自我感知特质评分和人格评分上的差异度，得到三个独立的差异矩阵。每个矩阵中的条目均描述了参与者两两之间的评分距离。通过表征相似性分析（representational similarity analysis），我们将这三个矩阵进行相互关联。结果显示，自我感知特质矩阵和人格矩阵分别与面部判断矩阵显著相关。这些结果表明，性格和社会特质倾向更相似的参与者更可能做出相似的社会面部判断。重要的是，即使控制年龄、性别、种族和地理位置等变量，这些关联仍保持稳定。研究发现，彼此更相似的人会以相似方式感知世界，这可能构成我们倾向于接近他人、建立联系和形成关系的基础。本研究已获得伦敦城市大学心理学研究伦理委员会批准，并进行了预注册，明确了样本量、纳入与排除标准（https://doi.org/10.17605/OSF.IO/ZR92G）。在此分享原始匿名数据及主要分析所用代码：README文件说明了文件夹内容（含各脚本功能），原始数据包含每位参与者的csv文件，代码可在MATLAB中运行。