Skip to main content
Fig. 3 | Journal of NeuroEngineering and Rehabilitation

Fig. 3

From: Effects of robot viscous forces on arm movements in chronic stroke survivors: a randomized crossover study

Fig. 3

Experiment conditions and timeline a Timeline of the experiment, each “block” of trials lasted for 5 min, and there was a short break (30–60 s) in after each block. b Negative viscosity. Forces were proportional to velocity in all three directions, we drove the forces to zero at higher speeds for safety. c Positive viscosity. Similar to negative viscosity but the forces acted opposite to the direction of motion, slowing the participants. d Breakthrough. Forces were proportional to velocity until the participants reached 75% of their baseline speed, forces were then removed as a reward for reaching faster speeds

Back to article page