2.2.1. Materials
The face stimuli for the psychometric test were taken from Cepulic et al. (2018). They were grayscale frontal images of Caucasian face models taken from Hildebrandt et al. (2010) and Asian models taken from Gao et al. (2008) (cf. Fig.1). All images were fitted within an ellipse of 200 × 300 pixels and showed no external features or non-face cues, such as clothing, glasses, beards, hair, or piercings.