Learning styles in capuchin monkeys were assessed with a computerized reversal- learning task called the mediational paradigm. First, monkeys were trained to respond with 90% accuracy on a two-choice discrimination (A+B–). Then the authors examined differences in performance on three different types of reversal trials (A–B+, A–C+, B+C–), each of which offered differing predictions for performance, depending on whether the monkeys were using associative cues or rule-based strategies. Performance indicated that the monkeys mainly learned to avoid the B stimulus during training, as the A–C+ condition produced the best performance levels. Therefore, negative stimuli showed greater control over responding after reversal and reflected a more associative rather than rule-based form of learning.
Beren, Michael J.; Klein, Emily D.; Evans, Theodore A.; Chan, Betty; Flemming, Timothy M.; Harris, Emily H.; Washburn, David A.; and Rumbaugh, Duane M.
"Discrimination Reversal Learn ing in Capu chin Monkeys (Cebus ap ella),"
The Psychological Record: Vol. 58
, Article 1.
Available at: http://opensiuc.lib.siu.edu/tpr/vol58/iss1/1