Fig. 2.

Hindleg grooming of the posterior ventral hindleg coxa (arrowhead) with all legs intact. A,1, 2, Stick figure sequences for two portions of one cycle of grooming for the time periods indicated by thebrackets in B. B, Hindleg and middle leg tibial and femoral joint angles as a function of time during an episode of grooming of the posterior ventral hindleg coxa.Filled squares indicate contact between the hindleg tibia–tarsus joint and the site of stimulation. C, Phase histogram of joint angles for the episode of grooming shown inB, generated from eight cycles. The reference joint angle was hindleg femoral elevation. This is the same animal as shown in Figure 1; other conventions as in Figure 1.