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dc.contributor.authorEckert, Johanna
dc.contributor.authorCall, Josep
dc.contributor.authorHermes, Jonas
dc.contributor.authorHerrmann, Esther
dc.contributor.authorRakoczy, Hannes
dc.identifier.citationEckert , J , Call , J , Hermes , J , Herrmann , E & Rakoczy , H 2018 , ' Intuitive statistical inferences in chimpanzees and humans follow Weber‘s Law ' , Cognition , vol. 180 , pp. 99-107 .
dc.identifier.otherPURE: 254028431
dc.identifier.otherPURE UUID: dc59052e-c95b-4b69-9325-e4872de66238
dc.identifier.otherScopus: 85049793503
dc.identifier.otherORCID: /0000-0002-8597-8336/work/46761186
dc.identifier.otherWOS: 000446284000009
dc.descriptionThis work was supported by a research grant of the German Science Foundation DFG (grant # RA 2155/3-1) to Hannes Rakoczy and Josep Call.en
dc.description.abstractHumans and nonhuman great apes share a sense for intuitive statistical reasoning, making intuitive probability judgments based on proportional information. This ability is of fundamental importance, in particular for inferring general regularities from finite numbers of observations and, vice versa, for predicting the outcome of single events using prior information. To date it remains unclear which cognitive mechanism underlies and enables this capacity. The aim of the present study was to gain deeper insights into the cognitive structure of intuitive statistics by probing its signatures in chimpanzees and humans. We tested 24 sanctuary-living chimpanzees in a previously established paradigm which required them to reason from populations of food items with different ratios of preferred (peanuts) and non-preferred items (carrot pieces) to randomly drawn samples. In a series of eight test conditions, the ratio between the two ratios to be discriminated (ROR) was systematically varied ranging from 1 (same proportions in both populations) to 16 (high magnitude of difference between populations). One hundred and forty-four human adults were tested in a computerized version of the same task. The main result was that both chimpanzee and human performance varied as a function of the log(ROR) and thus followed Weber´s law. This suggests that intuitive statistical reasoning relies on the same cognitive mechanism that is used for comparing absolute quantities, namely the analogue magnitude system.
dc.rights© 2018 Elsevier B.V. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at:
dc.subjectProbabilistic reasoningen
dc.subjectNumerical cognitionen
dc.subjectAnalogue magnitude systemen
dc.subjectSignature limitsen
dc.subjectGreat apesen
dc.subjectBF Psychologyen
dc.subjectQA Mathematicsen
dc.subjectRC0321 Neuroscience. Biological psychiatry. Neuropsychiatryen
dc.titleIntuitive statistical inferences in chimpanzees and humans follow Weber‘s Lawen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. Centre for Social Learning & Cognitive Evolutionen
dc.contributor.institutionUniversity of St Andrews. School of Psychology and Neuroscienceen
dc.description.statusPeer revieweden

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