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Contributo in rivista
Tipo: Articolo in rivista
Titolo: Tokens improve capuchin performance in the reverse –reward contingency task.
Anno di pubblicazione: 2011
Formato: Elettronico Cartaceo
Autori: Addessi, E. & Rossi, S.
Affiliazioni autori: CNR, Istituto di Scienze e Tecnologie della Cognizione
Abstract: In humans and apes one of the most adaptive functions of symbols is to inhibit strong behavioural predispositions. However, no study has yet investigated whether using symbols provides some advantage to non-ape primates. We aimed to trace the evolutionary roots of symbolic competence by examining whether tokens improve performance in the reverse-reward contingency task in capuchin monkeys, which diverged from the human lineage approximately 35 million years ago. Eight capuchins chose between: (1) two food quantities, (2) two quantities of "low-symbolic distance tokens" (each corresponding to one unit of food), and (3) two "high-symbolic distance tokens" (each corresponding to a different amount of food). In all conditions, subjects had to select the smaller quantity to obtain the larger reward. No procedural modifications were employed. Tokens did improve performance: five subjects succeeded with high-symbolic distance tokens, though only one succeeded with food, and none did with low-symbolic distance tokens. Moreover, two of the five subjects transferred the rule to novel token combinations. Learning effects or preference reversals could not account for the successful performance with high-symbolic distance tokens. This is the first demonstration that tokens do allow monkeys to inhibit strong behavioural predispositions, as occurs in chimpanzees and children.
Lingua abstract: inglese
Pagine da: 849
Pagine a: 854
Proceedings - Royal Society. Biological sciences
Numero volume: 278
Referee: Sì: Internazionale
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