Effects of haptic feedback type on performance. (A) Normalized number of targets acquired per haptic feedback type. Mean (±SE) and individual subject data, collapsed across visits. (B) Hand velocity and distance from target from a representative patient during the haptic nudge condition. Patient completed the movement after receiving a haptic nudge. (C) Hand path from a representative patient during the break-through condition, showing how the cursor moved on the surface of the force boundary before penetrating the target.