Abstract
The transfer index (TI) is a discrimination reversal paradigm that requires the achievement of a given prereversal criterion of accuracy. The mediational learning (ML) paradigm is a modification of the TI procedure that features the presentation of three different reversal conditions designed to assess whether prereversal learning is based on purely associative processes or mediated by the use of a strategy (win-stay/lose-shift). These two paradigms have been used with apes and several Old World monkey species, proving to be effective tools for the comparison of species on the basis of their transfer abilities and the nature of their learning processes. However, among New World monkeys, only the squirrel monkey has been tested. Capuchin (Cebusspp.) adaptability and their mastery in using tools have led to controversial interpretations of their cognitive and learning skills. We evaluated their mode of learning and the transfer of learning using the TI and the ML paradigms. We tested four tufted capuchins (Cebus apella)in a WGTA using a variety of stimulus object pairs. The results show that they possess rather good transfer abilities and one subject showed an associative learning mode. None of the subjects showed evidence of learning mediated by a win-stay/lose-shift strategy.
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De Lillo, C., Visalberghi, E. Transfer index and mediational learning in tufted capuchins (Cebus apella). Int J Primatol 15, 275–287 (1994). https://doi.org/10.1007/BF02735277
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DOI: https://doi.org/10.1007/BF02735277