The eye tracker recorded her eye movements accurately while the chimpanzee freely moved her head, hands, and body. Given the importance of eye contact in their social interactions, our results suggest that oxytocin may play modulatory roles in bonobos’ and chimpanzees’ species-specific social behavior and underscore the importance of oxytocin in hominid social evolution. A female chimpanzee wore a lightweight head-mounted eye tracker (60 Hz) on her head while engaging in daily interactions with the human experimenter. We found that oxytocin increased eye contact in bonobos but not chimpanzees while one chimpanzee showed an increase, interestingly, 5 out of 6 chimpanzees showed decreased looking to the eyes compared to the mouth, suggesting moderate eye avoidance. Oxytocin changed the eye-looking behavior of bonobos and chimpanzees differently. Following administration of either oxytocin or saline control with a nebulizer, chimpanzees (n = 6) and bonobos (n = 5) were shown images of conspecific faces while their eye movement was recorded. As a matter of fact, this allows them to run pretty fast. This study examined how intranasally-administered oxytocin affects eye contact in bonobos and chimpanzees using eye tracking. How do chimpanzees see things Well, usually their retina detects light in the lense of their eye. Find great deals on Chimpanzee, Close-Up of Eyes Photographic Print at, with fast shipping, free returns, and custom framing options youll. The average person can have as many as 120,000 strands on their head. This makes the combination almost impossible. Factor in the brown eyes, and only 5 of natural blondes naturally have brown eyes. dogs, monkeys, and humans), yet this effect has not been tested in any nonhuman great ape species. Only 2 of the entire population of the United States are born blonde. Oxytocin is known to increase attention to another’s eyes in many mammalian species (e.g. Previous studies have shown that bonobos and chimpanzees, humans’ two closest relatives, demonstrate considerable behavioral differences, including that bonobos look more at others’ eyes than chimpanzees. Despite generally conserved roles, oxytocin can function differently even in closely related species. Oxytocin has drawn significant research attention for its role in modulating mammalian social behavior.
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