Subjects tend to make more saccades with turning angles of 180 degrees preceding return fixations.

(A) Distribution of turning angles preceding return fixations. Bin size = 12 degrees. The sharp peak at 180 degrees shows that subjects often revert directions to return to their previously fixated location with short offsets (Fig 3). (B) Distribution of turning angles preceding non-return fixations. Bin size = 12 degrees. The curves tend to show a slight U-shape showing that subjects often either continue to move in the same direction or else move in the opposite direction.