Fig. 4: Six grasping motions of rehabilitation ball.

A The contact force signals of selected sensing units related to motions 1 and 2. B, C The contact force distribution map at time t1 and t2. D The contact force signals of selected sensing units related to motions 3 and 4. E, F The contact force distribution map at time t3 and t4 G The contact force signals of selected sensing units related to motions 5 and 6. H, I The contact force distribution map at time t5 and t6.