The study assessed contributions of different novelty pairings and reward types to exploration behavior across three successive discrimination learning problems in a 3 x 2 x 3 mixed design. After learning a simple two choice discrimination problem, Headstart subjects responded to six double reward trials and six extinction trials. A learning-to-learn effect occurred with regard to both problem solution and decision time. Epistemic curiosity was evident across problems to the extent that children would explore a novel object even after learning that the familiar object was associated with reward. Reward type did not affect response selection but did increase response latency on initial double reward trials. (Author)