Corrections and Clarifications

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Science  25 Apr 2011:
DOI: 10.1126/science.1202596


Reports: “The perception of rational, goal-directed action in nonhuman primates” by J. N. Wood et al. (7 September 2007, p. 1402). Wood et al. reported experiments on action perception with cotton-top tamarins, rhesus macaques, and chimpanzees. All of the research materials are available to support the findings from the tamarin and chimpanzee experiments. However, there are only summary data, as opposed to raw data, for the rhesus monkey experiments because the researcher who performed the experiments inadvertently failed to archive the original field notes. Upon realizing that the notes were unavailable, Wood and Hauser reran all of the rhesus experiments, using the same design and test population. Each trial was videotaped and coded blind to the experimental condition. They found the same pattern of results: Rhesus showed statistically significant choice responses after observing the intentional hand grasp and hand-occupied elbow touch actions, and responded at chance levels after observing the accidental hand flop and hand-empty elbow touch actions. A direct replication of the originally reported results on rhesus monkeys in Wood et al., including the raw data, is available at www.sciencemag.org/cgi/content/full/317/5843/1402/DC2.