Fig. 5.

Index of synergy ΔV_x,y as a function of the normalized swing time [mean (black line) ± SE (gray shadow), 5 cats] computed for the 2D paw position in space of 5 elemental variables. A: forelimb, regular walking. B: hindlimb, regular walking. C: forelimb, ladder walking. D: hindlimb, ladder walking. The top horizontal dotted line indicates the theoretical maximum of ΔV_x,y (1.67); the bottom dotted line indicates the theoretical minimum of ΔV_x,y (−2.5, see text for details). Solid diamonds indicate 10% time bins of swing for which ΔV_x,y is significantly different from zero (P < 0.05).