Fig. 7. Mean data of the tested flies responding to the black stripe displayed in the simulator at various frictional dampings. (A) Index of fixation (blue) and antifixation (red), calculated from the times the flies kept the stripe in the 90° frontal or caudal region of their the visual field, respectively. (B) Mean rotational velocity of the visual panorama during fixation (blue) and times without fixation behaviour (red). Grey area indicates threshold range of the visual system (cf. Materials and methods). (C) Relative probability of mean stripe position of the complete flight sequences plotted in pseudo-colour. Numbers in parentheses correspond to damping coefficients as listed in the legend to Fig. 3. Values are means ± s.e.m., N=24 flies.