Computer screen cursor trajectories as controlled by an Accupoint: a kinematic analysis

The kinematic efficiency of the Accupoint isometric joystick is addressed. 12 participants used an Accupoint to position a cursor 10 times for each of 12 possible targets situated in various directions (leftwards, above, rightwards), and requiring different levels of movement precision (large, small targets), over different movement amplitudes (near, far). Changes in cursor coordinates were sampled at 200 Hz. Relative to a mouse, the Accupoint acquired movement precision at a slower rate, and was less force efficient. While only 56% as efficient as the mouse, Accupoint cursor trajectories are more reliable in near space (but less reliable in far space).