Fig. 6. Summary of changes in collision-avoidance and landing responses with rate of image expansion. The collision-avoidance response for a given expansion rate (open circles) is the sinusoid amplitude best fitting the maximum change in the difference between wing-beat amplitudes (see Fig. 5, second row), normalized by the maximum mean amplitude. The width of the range of positions for which the probability of landing is greater than 0.5 characterizes the landing response for a given expansion rate (filled circles). This response is normalized by the maximum mean width value. Values are means ± S.E.M. for each fly.

Return to article