The preparation of actions and parameters of action: A fixed or variable process?

Some information processing models consider the selection of an action plan (deciding what to do) and the parameterization of the action (deciding how to do it) as separate stages in movement preparation. Further, these models consider the stages to occur in a fixed order, whereby the selection of an action precedes the parameterization of the action. Five experiments are reported that tested this position. The first four experiments adopted a …