Murray, Allison K.2014-09-182014-09-182013-11https://hdl.handle.net/1794/1827842 pages. A thesis presented to the Department of Psychology and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Arts, Fall 2013.First impressions carry much weight in social interaction. Working off of the evidence that individuals are remarkably accurate at judging faces for various traits, this study seeks to understand if this ability extends to judging a face for that person's hormonal profile. Forty-six undergraduates rated male and female faces across six personality dimensions - leadership, competence, dominance, facial maturity, likeability, and trustworthiness- as well as two hormonal traits - masculinity and stress (terms representing the general effects of the hormones testosterone and cortisol). Significant differences in the mean ratings made by male and female perceivers of target faces were found for likeability, facial maturity, and masculinity. A correlation between male targets' testosterone over cortisol ratio (T /C) and whether or not they were smiling was also found. Males' T /C ratio was also indicative of others' perceptions of them as more trustworthy, more likeable, and less stressed.en-USAll Rights Reserved.First ImpressionsTestosteroneCortisolJudgmentFacesLeadership TraitsThesis / Dissertation