An exploratory study of gaze‐monitoring in nonhuman primates1

: Eleven species of nonhuman primate were tested in a gaze-monitoring task to examine whether they would look where the experimenter looked or pointed. Chimpanzees and an orangutan showed higher correct-response rates than other species. A high correlation was found between correct responses on the gaze-monitoring task and the length of time that the subject continuously concentrated on the experiment.

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