Interaction of cognitive and biochemical factors in the organization of graphic movements

The paper reviews three experiments in which the stroke sequences adopted in the copying of simple geometrical patterns are studied as a function of higher-order and lower-order variables. Among the higher-order variables are the symbol class of the context in which the target stimuli are presented, and the option to execute the same motor program repeatedly. The lower-order variables are concerned with the biomechanical features of the effector system