Page 88 - Demo

Chapter 486Age and SexWe investigated whether adding either age or sex to the model did improve the predictive accuracy relative to the simple model. Both the model including sex (ΔelpdLOO = 4.4 [1.7]) and the model including age (ΔelpdLOO = .5 [2.9]) had a slightly lower predictive accuracy than the simple model. Altogether, this suggests that including age or sex did not improve the predictive accuracy of the model.Experiment 3MethodParticipantsExperiment 3 included 150 new participants (73 females, mean age = 30.98 years, SD = 12.65, ranging from 18 to 70 years old). Participants were visitors at the Apenheul Primate Park (Apeldoorn, the Netherlands). All participants selfreported normal or corrected-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 (CEP18-0531/272). Participants were not compensated for their participation.Experimental DesignThe experiment held a randomized within-subjects design, where independent variables comprised congruence (looking direction congruent with dot or not), attractiveness category of the stimulus (attractive, intermediate, unattractive), age, and sex. The dependent variable was RT (ms).StimuliFaces were selected from the Oslo Face Database (Chelnokova et al., 2014). This database includes 200 faces (100 females) with a neutral expression and with three gaze directions: left, center, and right. All stimuli have been rated for attractiveness. Based on these ratings, we chose 10 attractive, 10 intermediate, and 10 unattractive faces of each sex.The ages of the people in the photographs were not recorded, so it was not possible to analyze whether age differed between the stimulus categories. However, because the database consists of pictures of students, it is likely that they are in the same age range.Tom Roth.indd 86 08-01-2024 10:41