Context Effects in Probability Learning and Decision-Making

Separate groups of Ss were trained in multiple probability-learning situations where sets of probabilities were (a) .10, .20, .30, .40, .50, (b) .50, .60, .70, .80, .90, and (c) .10, .30, .50, .70, .90, respectively. Subsequent to the training session Ss received test trials on all combinations of the five probabilities. Differential training with equal probabilities in different contexts gave different learning curves. Ss' uses of these probabilities in the test situations also varied as a function of prior training.