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. 2017 Jun 1;5:e3413. doi: 10.7717/peerj.3413

Figure 1. The six pictures presenting the six Barbary macaques’ facial expressions related to the four emotional stated tested.

Figure 1

(A) and (B) ‘aggressive’ or ‘threat’ face; (C) and (D) ‘distressed’ or ‘submissive’ face; (E) ‘friendly’ or ‘affiliative’ face; (F) ‘neutral’ face. The description of each facial expression is detailed in the text. Photo credit: Laëtitia Maréchal (A, C), Julia Fischer (B, D, E), and Andrew Forsyth (F).