Article PubMed
PloS one  (2010)

Human's cognitive ability to assess facial cues from photographs=> a study of sexual selection in the Bolivian Amazon.

Undurraga, Eduardo A; Eisenberg, Dan T A; Magvanjav, Oyunbileg; Wang, Ruoxue; Leonard, William R; McDade, Thomas W; Reyes-García, Victoria; Nyberg, Colleen; Tanner, Susan; Huanca, Tomás; Godoy, Ricardo A