The team asked a human experimenter to peer at the ceiling while sitting near an infant or an ape. If he looked up with only his eyes, they observed that human babies would also peer up, but chimpanzees wouldn’t. While eyes didn’t matter to chimpanzees, they would follow if the experimenter tilted his head up . This research suggested that we have different inclinations from chimpanzees, but it wasn’t clear whether the whites of our eyes play a role.
To measure this response, Kano presented human and chimpanzee participants with a computer screen displaying slivers of human or chimpanzee faces. Subjects of both species were asked to indicate where the eyes were looking. It turned out that both the humans and chimpanzees could more easily follow human eyes, as reported by Kano and his team in anThe researchers then manipulated the images to appear as if they were taken far away at night.
But to support communication, the whites of human eyes must be paired with the cognitive ability to glean where exactly someone is looking. Beyond their proclivity for following heads, chimpanzees don’t track eyes naturally and are more adept at following an individual’s head tilt. The researchers trained 10 chimpanzees for several months in preparation for these experiments, and only three successfully learned how to track eyes.
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