Fig. 4.

Schematic of the definition of saccade endpoint deviation (a) and saccade trajectory deviation (b). Saccade endpoint deviation (φ) is the angular distance between the participants baseline route (- - -) from the start of the saccade (x) to the target location (T) and the direct route (….) from the start of the saccade to the end of the saccade (+). Saccade trajectory deviation (φ) is the angular distance between the mean location of the saccade trajectory sample points (●) and the direct route from the start of the saccade and the target location (- - -). The participants mean trajectory deviation in the No Distractor condition is used as a baseline (β) and, depending on its relative location, added to or subtracted from the trajectory deviation of each trial (α). In case of the presence of a distractor a shift of the endpoint towards the distractor (D) is positive (φ) and a shift away from the distractor is negative (−φ).