Development of associative and perceptual interference

In a choice reaction-time letter-identification task, the temporal development of perceptual and associative interference was studied with visual displays containing identical, irrelevant, or response-incompatible noise letters. Using the methods of variable-criterion theory, it was determined that perceptual interference is complete very early and has no effect on the shape of the function for the growth of associative strength. Associative interference begins later, gradually increases to a maximum, and then declines to zero at long latencies. In experiments with speeded performance, it was also found that the growth of excitatory strength for errors contains the same nonmonotonic process as for correct responses, but in reverse form. In addition, it was observed that the discriminability of the target stimuli affects the rate of growth of associative strength for the correct response. Analyses of individual differences in theoretical parameters indicate information-processing patterns similar to those reported for simple auditory tasks.