Response scale effects and integration processes in the averaging of motor movements.

In two experiments Ss averaged pairs of fixed, linear motor movements. A production method of motor averaging was used in Exp. 1, and category scaling procedures were used in Exp. 2. Stimulus interaction effects were found in Exp. 1 but not in Exp. 2. Prior exposure to long or to short movements produced slight contrast effects in each experiment, but the nature of these effects differed between experiments. Results were interpreted within the context of averaging models of information integration theory. The implications of these models for theories of motor retention were discussed.