Macaques know when humans and machines are being unfair and understand the difference between the two, a study shows.
of a monkey flinging cucumber slices back at a researcher after seeing the monkey in the next cage get a grape for performing the same task.
Understanding such reactions is important “in the context of learning more about human evolution,” said study co-author “If the monkeys were reacting due to a sense of inequity, we would have seen frustration only when the other monkey was getting a better reward,” said Titchener, who is also a researcher in cognitive ethology at the German Primate Center — Leibniz Institute for Primate Research . “Instead, we saw food refusal consistently with the human, as compared to the machine.”
That the monkeys focused on the human “suggests that this is a social response,” said Brosnan, who was not involved in the German research.
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