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dc.contributor.authorHanus, Daniel
dc.contributor.authorMendes, Natacha
dc.contributor.authorTennie, Claudio
dc.contributor.authorCall, Josep
dc.identifier.citationHanus , D , Mendes , N , Tennie , C & Call , J 2011 , ' Comparing the performances of apes ( Gorilla gorilla, Pan troglodytes, Pongo pygmaeus ) and human children ( Homo sapiens ) in the floating peanut task ' , PLoS ONE , vol. 6 , no. 6 , 19555 .
dc.identifier.otherORCID: /0000-0002-8597-8336/work/37477811
dc.descriptionThere is no current external funding source. The internal funders (MPI) had no role in study design, data collection and analysis, decision to publish or preparation of the manuscripten
dc.description.abstractRecently, Mendes et al. [1] described the use of a liquid tool (water) in captive orangutans. Here, we tested chimpanzees and gorillas for the first time with the same "floating peanut task." None of the subjects solved the task. In order to better understand the cognitive demands of the task, we further tested other populations of chimpanzees and orangutans with the variation of the peanut initially floating or not. Twenty percent of the chimpanzees but none of the orangutans were successful. Additional controls revealed that successful subjects added water only if it was necessary to obtain the nut. Another experiment was conducted to investigate the reason for the differences in performance between the unsuccessful (Experiment 1) and the successful (Experiment 2) chimpanzee populations. We found suggestive evidence for the view that functional fixedness might have impaired the chimpanzees' strategies in the first experiment. Finally, we tested how human children of different age classes perform in an analogous experimental setting. Within the oldest group (8 years), 58 percent of the children solved the problem, whereas in the youngest group (4 years), only 8 percent were able to find the solution.
dc.relation.ispartofPLoS ONEen
dc.subjectFunctional Fixednessen
dc.subjectCumulative Cultureen
dc.subjectCaledonian Crowsen
dc.subjectArcher Fishen
dc.subjectQL Zoologyen
dc.titleComparing the performances of apes (Gorilla gorilla, Pan troglodytes, Pongo pygmaeus) and human children (Homo sapiens) in the floating peanut tasken
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Psychology and Neuroscienceen
dc.contributor.institutionUniversity of St Andrews. Centre for Social Learning & Cognitive Evolutionen
dc.description.statusPeer revieweden

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