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Fig. 5. Turning and straight stepping in the two-leg preparation (A) Schematic
drawing of a stick insect with the mean anterior extreme position (AEP) and
posterior extreme position (PEP) values (and s.d.) for the straight walking
and turning two-legged-preparation (2L). Red marks the values for the averaged
steps for the inside leg, dark yellow for the outside legs and black for the
straight stepping legs. Pink (inside), light yellow (outside) and gray
(straight walking) mark the connections between AEP and PEP in the respective
legs of the intact animal. (Ai) 2L–front leg preparation (2L–FL).
(Aii) 2L–middle leg preparation (2L–ML). (B)Mean vectors of stance
phase movement of the inside (red), outside (dark yellow) and straight
stepping (black) left legs, drawn to the mean step length as calculated
between AEP and PEP for the 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. 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 and
4. (E)Mean step length of front
and middle leg 2L-preparation during inside turning (red, in), straight
stepping (black, str) 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 three behavioral conditions, given in deg.
Coloring is the same as in E. Significance levels in E and F are:
**P<0.01; ***P<0.001; n.s., not
significant. iFL, inside front legs; iML, inside middle legs; oFL, outside
front legs; oML, outside middle legs.
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