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Chapter 476corrected-to-normal vision and were heterosexual. The experimental procedures were in accordance with the Declaration of Helsinki, and the study was reviewed and approved by the Psychology Ethics Committee of Leiden University (CEP17-0719/254). Participants were not compensated for their participation.Experimental DesignThe experiment held a randomized within-subjects design, where independent variables comprised attractiveness category of the stimuli, participant’s age, and sex. The dependent variable was RT (in ms).ApparatusThe task was performed on a touchscreen (Dell corporation, model S2240Tb, 21.5 in., 1,920 × 1,080 pixels), which was connected to a Dell laptop computer (model OPTIPLEX 990) and ran via E-Prime (Version 2.0; Psychology Software Tools). The touchscreen was located in a public but quiet corner of an indoor visitor enclosure of the park. To minimize potential distractors, we set up the touchscreen on a table adjacent to a wall. Participants sat at a distance of approximately 60 cm from the touchscreen.StimuliStimuli were selected from the Chicago Face Database (CFD) 2.3 (Ma, Correll, et al., 2015). This face database consists of 597 high-resolution, standardized color photographs of male and female faces of varying ethnicity between the ages of 18 and 65 years. The faces have been validated previously by independent judges on several scales, including on attractiveness (Ma, Correll, et al., 2015). Based on these CFD attractiveness ratings, we selected stimuli depicting 10 attractive, 10 unattractive, and 20 intermediately attractive White individuals.We tested whether age differed between the stimulus categories, using a Bayesian two-way analysis of variance (Sex × Attractiveness Category), since older faces may be perceived as less attractive than younger faces (Ebner, 2008). We found moderate evidence for the null hypothesis that age did not differ between the sexes (BF01 = 4.18 ± .02%) and attractiveness categories (BF01 = 3.72 ± .03%). In addition, we found strong evidence for the null hypothesis when testing the interaction between sex and attractiveness category (BF01 = 78.95 ± .67%), suggesting that age did not substantially differ across stimulus categories.Tom Roth.indd 76 08-01-2024 10:41