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We appreciate the methodological concerns of Henrich and Silk (1), which resemble those of Jensen et al. (2). Both critiques focus on the lack of refusals by the responders in our ultimatum game (UG) (3), an option on which the subjects were never trained. As discussed previously (4, 5), we fail to see how this lack of refusals would invalidate the behavioral change measured in the …

Reply to Henrich and Silk: Toward a unified explanation for apes and humans