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Fig. 7. Rapid backward movement of a nymph following a tactile stimulus to the head. (A) Selected frames from the whole sequence. In the first frame, at 0 ms, the insect stands erect and then starts to collapse backwards so that at 120 ms the abdomen rests on the ground. (B) Graph of the changes in angle between a hind femur and the body and between the femur and tibia of a hind leg. The angles are marked in the first frame of A. The height of the body and the horizontal, backward displacement of the head are also plotted.





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