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Examples of stimuli employed by to test the role of general structural properties in face preference. (A,B) stimuli used to test up-down asymmetry (Simion et al., 2002; Turati et al., 2002); (C) real faces employed to test up-down asymmetry (Macchi Cassia et al., 2004); (D–F) stimuli used to test congruency (Macchi Cassia et al., 2008); (G) real faces employed to test up-down asymmetry and congruency (Macchi Cassia et al., 2004).
