THE LAMBDA-MODEL FOR MOTOR CONTROL - MORE THAN MEETS THE EYE - AUTHORS RESPONSE

Understanding of the lambda model has greatly increased in recent year s as evidenced by most of the commentaries. Some commentators undersco red the potential of the model to integrate aspects of different senso rimotor systems in the production of movement. Other commentators focu sed on not-yet-fully-developed parts of the model. A few persisted in misunderstanding some of its basic concepts, and on these grounds they reject it. In responding to commentaries we continue to elaborate on some fundamental points of the model, especially control variables, th e idea of movement production by shifting the positional frame of refe rence and the hypothesis of biomechanical correspondence in motor cont rol. We also continue to develop our ideas on the intrinsic generation of the frame of reference associated with external space and utilized for the control of arm movement and locomotion. The dynamic principle s underlying the model are discussed in light of the dynamical systems approach.