The interactive robot features involve visuomotor tasks, moving the robotic manipulandum according to targets on a computer screen mounted at eye level. A key feature of MIT robots is the low near isotropic inertia and reduced friction in the robot arm so that, when appropriate, it can "get out of the way." The force required to move the robotic arm is minimal, comparable to moving unrestricted, and if a patient cannot move the robot arm, it will guide the limb to provide an adaptive sensorimotor experience.