Respect voor dieren

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zondag 27 augustus 2017

FRANS DE WAAL - continued



Een van de experimenten door Frans de Waal uitgevoerd met chimpansees gaat over “onrechtvaardige beloning”. Een chimpansee weigert een beloning met voedsel als hij ziet dat een andere chimpansee lekkerder voedsel krijgt.

Het  experiment wordt nog eens dunnetjes overgedaan door het Max Planck Instituut in Leipzig; samenvatting hieronder. Ik begrijp niet waarom hiervoor chimpansees in gevangenschap gehouden moeten worden. Welk belang hebben dit soort experimenten voor de dieren?


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Chimpanzees’ refusal of less-preferred food when an experimenter has previously provided preferred food to a conspecific has been taken as evidence for a sense of fairness. Here, we present a novel hypothesis—the social disappointment hypothesis—according to which food refusals express chimpanzees' disappointment in the human experimenter for not rewarding them as well as they could have. We tested this hypothesis using a two-by-two design in which food was either distributed by an experimenter or a machine and with a partner present or absent. We found that chimpanzees were more likely to reject food when it was distributed by an experimenter rather than by a machine and that they were not more likely to do so when a partner was present. These results suggest that chimpanzees’ refusal of less-preferred food stems from social disappointment in the experimenter and not from a sense of fairness.

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