Experiments of Variables Confounding with Percentage of Reinforcement in Concept Learning

Concept learning was studied with partial or continuous reinforcement, and reinforcement for placement or reson. 80 Ss placed cards right or left and were reinforced for placements. Another group of 40 Ss placed cards right or left and gave trial by trial reasons and were reinforced for reasons. In Exp. I, during acquisition, half of Ss received 100%, and half 50% reinforcement until each reached 50 times of reinforcements. In Exp. II, during acquisition. half received 100%, and half 50% reinforcement until each reached 100 trials. The reasons for placement were odd number of figures per card to the left, and cards with even number of figures to the right. Shifting period had 100 trials with 100% reinforcement, and the reasons for placement were shifted to color: dark colors to the right and light colors to the left.