Figure 2
'Reaching' Task. A) View of 'Reaching' scene. Each practice block contains 20 cubes (1 cube = 1 trial) presented in relation to each participant's shoulder position. A "virtual hand" corresponds to the location and movement of the paretic hand via a magnetic marker placed either in the palmar surface of a glove or directly onto the dorsum of the hand at the 3rd metacarpal head. Both visual and auditory feedback indicates successful collision of the "virtual hand" with a cube. B) Interface for practice trial configuration. Pitch angle, yaw angle, and percentage of arm length (distance from the acromion to the radial styloid with the elbow extended) were chosen for each cube within a practice block. Practice blocks were designed to address reaching ability using arm lengths ranging from 10% to 120%. A similar interface was used to develop 'Ball Shooting' practice blocks.