{"pk":28647,"title":"Intrinsic whole number bias in an indigenous population","subtitle":null,"abstract":"Probabilities can be described by a numerator and a de-nominator and students and decision-makers are not in-different to numerical values of the components. For in-stance, when people compare two equal ratios their choicesgravitate to the option with larger number, even if theyknow both ratios are equal. To the date, however, it is un-clear if whole number biases are present in other cultures.We tested a farming-foraging group living in the Bolivianrain forest in a simple 2AFC ratio comparison task. Af-ter appropriate training, the Tsimane were highly accu-rate in this task, confirming that visual proportional rea-soning is present across cultures. Importantly, they hada strong tendency to favor large numbers in equal ratiocomparisons, similar to what is found in educated popu-lations. Even though our sample size is moderate (n=76),the whole number bias we found occurred under good pro-portional reasoning. The bias may be a general feature ofcognition, rather than a cultural or education artifact, thatmay help humans solve ambiguous situations.","language":"eng","license":{"name":"","short_name":"","text":null,"url":""},"keywords":[{"word":"Tsimane; Numerical cognition; Fraction;Probability; Whole number bias"}],"section":"Papers with Poster Presentations","is_remote":true,"remote_url":"https://escholarship.org/uc/item/69w031hg","frozenauthors":[{"first_name":"Santiago","middle_name":"","last_name":"Alonso-Díaz","name_suffix":"","institution":"Universidad Javeriana","department":""},{"first_name":"Jessica","middle_name":"F.","last_name":"Cantlon","name_suffix":"","institution":"Carnegie Mellon","department":""},{"first_name":"Steven","middle_name":"T.","last_name":"Piantadosi","name_suffix":"","institution":"Berkeley University","department":""}],"date_submitted":null,"date_accepted":null,"date_published":"2019-01-01T18:00:00Z","render_galley":null,"galleys":[{"label":"PDF","type":"pdf","path":"https://journalpub.escholarship.org/cognitivesciencesociety/article/28647/galley/18518/download/"}]}