Fig. 6. Turning in the single-leg preparation. (A) Schematic drawings of a stick insect segment with the mean anterior extreme position (AEP) and posterior extreme position (PEP) values (and s.d.) for the turning 1L-preparation in the inside (Ai) and outside (Aii) front leg, and the inside (Aiii) and outside (Aiv) middle leg. The darkly colored traces with error bars mark the single-leg preparations, the lighter shaded red and yellow bars mark the connection between mean AEP and PEP in the 2L (red) and the intact preparations (light red or yellow) for comparison (B) Mean vectors of stance phase movement of the inside (red) and outside (yellow) stepping left legs, drawn to the mean step length as calculated between AEP and PEP for the single front and middle legs. (C,D) Step-to-step variability in angle and length of all stance phase movement vectors for the inside (C, red) and outside (D, dark yellow) front and middle legs (iFL, inside front legs; iML, inside middle legs; oFL, outside front legs; oML, outside middle legs). All vectors of the right side legs were again mirror imaged to show only left side stepping; coloring is the same as in Figs 3, 4 and 5. (E) Mean step length of front and middle leg 1L-preparation during inside turning (red, in), and outside leg stepping (dark yellow, out) in mm. (F) Mean angles of the stance phase movement vector between AEP and PEP in the front and middle legs under the two behavioral conditions, given in deg. Coloring is the same in E. Significance levels in E and F are: ^***P<0.001; n.s., not significant.