Data from: Social disappointment explains chimpanzees' behaviour in the inequity aversion task

Jan M. Engelmann, Jeremy B. Clift, Esther Herrmann & Michael Tomasello
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...
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