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The way to a chimpanzee's heart is through its stomach
Date:1/16/2014

ithin one hour after the chimpanzees either shared food or socially fed without sharing. The result: A chimpanzee's urine contained significantly higher levels of oxytocin after sharing food with another group member than just after feeding socially regardless whether the animal was the donor or the receiver of the food. "Increased urinary oxytocin levels were independent of whether subjects gave or received food, shared with kin or non-kin, shared with an established bond partner or not, or shared meat or other food types", says Roman Wittig.

In addition, the researchers found that the oxytocin levels associated with food sharing were higher than those associated with grooming, indicating that the rarer food sharing has a stronger bonding effect than the more frequently occurring grooming. "Food sharing may be a key behaviour for social bonding in chimpanzees", says Wittig. "As it benefits receivers and donors equally, it might even act as a trigger and predictor of cooperative relationships."

The researchers further suggest that food sharing likely activates neurobiological mechanisms that originally evolved to support mother-infant bonding during lactation. "Initially, this mechanism may have evolved to maintain bonds between mother and child beyond the age of weaning", says Wittig. "It may then have been hitch-hiked and is now also promoting bond formation and maintenance in non-kin cooperative relationships."

The Latin roots of the word companion ('com = with' and 'panis = bread') may indicate a similar mechanism to build companionship in humans. Whether human urinary oxytocin levels also increase after sharing a meal with others will be a subject for future studies.


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Contact: Dr. Roman Wittig
wittig@eva.mpg.de
49-341-355-0204
Max-Planck-Gesellschaft
Source:Eurekalert  

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