Fig. 9. Wingtip projection during upward and downward image motion at 160° s^–1. The two-dimensional projection of the wingpath is plotted for a single individual before (blue) and after (red) stretch receptor ablation and for downward (top row) and upward (middle row) image motion. The average wingpath evoked by upward image motion is shown in the bottom diagram (N=3). The data were digitized from video images recorded at 500 frames s^–1.