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Appendices222Appendix A: Supplementary Material for Chapter 2Supplementary Table 1 – Overview of studies on sexually selective cognition in primates.Study Method Species Main findingWaitt et al., 2003 Preferential looking (simultaneous)Rhesus macaque (Macaca mulatta)Females showed an attentional bias towards red male faces compared to more pale faces.Cooper & Hosey, 2003Preferential looking (sequential)Common brown lemur (Eulemur vulvus) & controls that do not experience sexual dichromatism (Lemuridae)Common brown lemur females showed an attentional bias towards more brightly coloured male pelage, while this was not the case for the control individuals, suggesting that sexual dichromatism plays a role in mate choice.Deaner et al., 2005Preference task Rhesus macaque (Macaca mulatta)Male macaques could choose to see an empty screen or a picture, with each choice receiving different kinds of rewards. Results showed that macaques were willing to give up reward to see pictures of high-status faces and perinea.Waitt & Little, 2006Preferential looking (simultaneous)Rhesus macaque (Macaca mulatta)Macaques showed an attentional bias towards symmetrized faces. However, this effect was especially driven by female observers.Waitt et al., 2006 Preferential looking (sequential)Rhesus macaque (Macaca mulatta)Males show more attention to pictures of reddened female hindquarters compared to less red hindquarters. This effect was not found for female faces.Gerald et al., 2007Preferential looking (sequential)Rhesus macaque (Macaca mulatta)Females show more attention to pictures of reddened female faces and hindquarters compared with more pale versions of the same picture.Lacreuse et al., 2007Effort Rhesus macaque (Macaca mulatta)Ovulating females, but not non-ovulating female, pressed longer when they would see a male face than a female face. However, they only showed this effect for same-species stimuli.Higham et al., 2011Preferential looking (simultaneous)Rhesus macaque (Macaca mulatta)Males looked longer at faces of ovulating females when paired with faces of non-ovulating females. This effect was especially pronounced when males were shown pictures of familiar females.Watson et al., 2012Preference test Rhesus macaque (Macaca mulatta)In a preference task, female macaques could choose to either see a picture or an empty screen. They picked the pictureoption most frequently when they knew the picture would be of either a perineum or of a high-status face.Pflüger et al., 2014Preferential looking (simultaneous)Japanese macaque (Macaca fuscata)Males looked longer at faces of intensely coloured female faces.Tom Roth.indd 222 08-01-2024 10:42