Masaki Tomonaga, Tomoko Imura
Visual search for human gaze direction by a chimpanzee (Pan troglodytes).
PLoS ONE, 5(2): e9131, doi: 10.1371/journal.pone.0009131
Humans detect faces with direct gazes among those with averted gazes more efficiently than they detect faces with averted gazes among those with direct gazes. We examined whether this “stare-in-the-crowd” effect occurs in chimpanzees (Pan troglodytes), whose eye morphology differs from that of humans (i.e., low-contrast eyes, dark sclera).