[...] we show experimentally that cooperative behavior of female rats is influenced by prior receipt of help, irrespective of the identity of the partner. Rats that were trained in an instrumental cooperative task (pulling a stick in order to produce food for a partner) pulled more often for an unknown partner after they were helped than if they had not received help before.
The paper, published in PLoS Biology, is free to access. With the exception of direct reciprocity (the 'you've been nice to me, I'll be nice to you' type), no other mechanism for reciprocity had ever been demonstrated in nonhuman animals before.
'Altruistic behavior by previous social experience irrespective of partner identity' is fundamental to human society, and perhaps the single behaviour economic theory most struggles with.
The Irulas specialize in catching rats, an activity which provides the bulk of their income and food. Following a routine visit to a local village, Sethu recognized an opportunity for a "better rat trap" to aid the Irula rat catchers. With feedback from rat catchers, Sethu developed an innovative new trap. His innovation won the prestigious Global Development Marketplace award from the World Bank which provided the funding necessary to commercialize the new technology. The venture's implementation involved site visits to identify beneficiaries, health checks and treatment, preparatory workshops, factory establishment, factory training, production, women's micro-credit collectives, distribution, and project evaluation.
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