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. 2016 Aug 4;4:e2304. doi: 10.7717/peerj.2304

Figure 1. Visual preferences of chimpanzees for different types of faces.

Figure 1

(A) An example of three different types of stimuli: familiar face (i), intermediate face (ii) and novel face (iii). (B) The mean-proportional fixation duration for each of the face types. (C) The mean-proportional fixation count for each of the face types. (D) The mean-proportional saccade length for each of the face types. Boxplots describe the responses to each type of facial stimuli. *p < 0.05, **p <0.01 (Friedman test).