Figure 5

Left: Same picture as Figure 3 Left (except that the game has been played a bit further), showing the reconstruction at this early stage of the game, without the star of rays. Middle: The hidden image containing one target “tumor” (gray circle) and the cluttering objects near and far. This image was hidden from the player during gameplay. Right: The track of the central-points used in the game by the player, superimposed on the hidden image, which the player couldn’t see. The long straight lines are hand/eye movements that were straightened by the mouse interpolation algorithm. While the image on the left includes the target, it does not accurately reconstruct any of the objects, and some artifacts appear that are comparable to the real objects. As play continues, these artifacts can be seen to have disappeared (Figure 3, Middle and Right), perhaps because the player paid some attention to them (Right).