Probability Learning When Stimuli Vary on Multiple Dimensions
E. Scott Geller, Charles P. Whitman · The American Journal of Psychology · 1972
With both location and shape of stimuli varied simultaneously on independent binary probability schedules, the prediction distributions of subjects who had a 70%-30% schedule on each dimension eventually 'matched' the theoretical probabilities, but those of subjects who had a 50% -50% on one dimension underapproximated the theoretical probabilility for the 70% alternative of the other dimension. Even with the color of the stimuli also varied, subjects' prediction distributions showed they were discriminating all three schedules.