Fig. 3. Mean position probability of freely flying fruit flies at various rotational velocities of the flight arena (bin width, 4 mmx4 mm). (A) Stationary pattern. (B) 100, (C) 300, (D) 500, (E) 700 and (F) 900° s^–1 arena velocity. The outer rings represent the random-square pattern while the white line marks the position of the immovable translucent inner cylinder. All position histograms are normalized to the same data sum and position probability is plotted in pseudo-colour.