ترجیحات مشروط محیط: مواجهه با نشانه های بصری ترجیحات رقابت مستقیم مرد با مرد و افزایش ثروت زنان برای مردسالاری در چهره مردان

Previous studies show that parasite prevalence and mortality/health are related to cultural variation in women's preferences for attractive and masculine traits in men. Other studies have suggested that both male–male competition and wealth may also be important correlates of cross-cultural variation in women's masculinity preferences. Here we examined whether exposure to cues of direct male–male competition, violence, or wealth influenced women's face preferences. We showed women slideshows of images with cues of low and high direct male–male competition/violence or wealth and measured their visual preferences for masculine face traits. Recent visual experience changed women's preferences for facial masculinity, with women preferring more masculine male faces after exposure to images of men engaged in direct physical competition, images of weapons, or images depicting items of high monetary value. Recent visual experience had no significant effects on preferences for masculinity in same-sex faces. Given that high levels of direct physical competition and violence among males may increase the importance of direct intra-sexual competition, it may be adaptive for women to shift visual preferences in favor of males with face cues indicating physical strength and dominance over investment in such environments. Similarly, in wealthy environments investment may be less important than other aspects of quality and so it may be adaptive for women to shift visual preferences in favor of males with face cues indicating other aspects of quality over investment. Overall, our data demonstrate that preferences can be strategically flexible according to recent visual experience and support the notion of environment contingent preferences.

Across many animal species, sexual dimorphism is an important trait involved in sexual selection (Andersson, 1994). Sexually dimorphic traits in human faces have received much attention by those interested in evolutionary approaches to human preferences and perception (see e.g., Thornhill & Gangestad, 1999). Sexually dimorphic traits (relative masculinity/femininity) in human male faces has been proposed to relate to both inter-sexual selection (Little et al., 2011b and Thornhill and Gangestad, 1999), influencing attraction to the opposite sex, and intra-sexual selection (Swaddle & Reierson, 2003), relating to competition between members of the same sex. In terms of attractiveness to the opposite sex, there are benefits that could be associated with sexual dimorphism: (1) indirect benefits, genetic benefits that are passed to offspring such as genes associated with strong immune systems, and (2) direct benefits, benefits that are directly passed to mates or offspring such as resources or avoidance of disease.