title: Sex-contingent face after-effects suggest distinct neural populations code male and female faces.
abstract: Exposure to faces biases perceptions of subsequently viewed faces. Faces similar to those seen previously are judged more normal and attractive than they were prior to exposure. Here we show sex-contingent after-effects following adaptation to eye-spacing (experiment 1), facial identity (experiment 2) and masculinity (experiment 3). Viewing faces of one sex with increased eye-spacing and faces of the other sex with decreased eye-spacing simultaneously induced opposite after-effects for male and female faces (assessed by normality judgments). Viewing faces transformed in identity or masculinity increased preferences for novel faces with characteristics similar to those viewed only when the sex of the faces presented in the adaptation phase and in post-adaptation preference tests were congruent. Because after-effects reflect changes in responses of neural populations that code faces, our findings indicate that distinct neural populations code male and female faces.
authors.affiliation: University of Liverpool, School of Biology, Liverpool L69 7ZB, UK. a.c.little@liverpool.ac.uk
authors.forename: Anthony C
authors.initials: AC
authors.lastname: Little
authors.forename: Lisa M
authors.initials: LM
authors.lastname: DeBruine
authors.forename: Benedict C
authors.initials: BC
authors.lastname: Jones
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D005145:Face / Q000033:anatomy & histology*; D005260:Female; D005366:Figural Aftereffect / Q000502:physiology*; D006801:Humans; D007600:Judgment; D008297:Male; D009474:Neurons / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation; D012737:Sex Factors