Fig. 1

Bimanual tasks on the REAplan®. A General setup of the bimanual version of the REAplan® robot. Note that each hand slid exclusively along one axis and thus controlled a different direction of the common cursor (small arrowhead) displayed on the REAplan® screen. The forearms rested in gutters and were strapped in, and handles were adapted if needed. B Different circuit of identical length and difficulty for the generalization. C Cursor displacement with regard to the ideal trajectory defined as the center of the circuit track (surface = error), D REACHING task: four eccentric targets designated in a pseudorandomized order (16 trials/target)