The COG bias is illustrated in Figure 3. In the first row (top), there are no extraneous stimuli near the saccade target. Hence, the saccade from the point of fixation to the target is unbiased. In the second row, by contrast, the location of an extraneous stimulus (×) results in a saccade from the point of fixation that undershoots its target, while in the third row the saccade overshoots its target. In the fourth row, changing the location of the extraneous stimulus eliminates the COG bias: because the extraneous stimulus is near the point of fixation rather than the saccade target, the saccade is accurate.