IS THE MULTIJOINT POINTING MOVEMENT MODEL APPLICABLE TO EQUILIBRIUM CONTROL DURING UPPER TRUNK MOVEMENTS

Two aspects of the target article, (1) the extension of the equilibriu m point theory to multi-joint movements, and (2) the consequence that the EMG pattern is not directly controlled by the central nervous syst em (CNS), are discussed in light to the experiments on upper trunk ben ding in humans. The principle component kinematic analysis and the ana lysis of the EMG data, obtained under microgravity and additional load ing conditions, support the application of Feldman and Levin's for mul ti-joint pointing movement to equilibrium control during upper trunk m ovement.