Fig. 4: Characteristics of the control of interlimb coordination, represented by f(ΔLR).
From: Interlimb coordination is not strictly controlled during walking
a Approximation of f(ΔLR) by a piecewise linear function within 3 standard deviations (3SD) (vertical dotted lines) from the mean of the observed ΔLR. The quantity lC is the length of the flat region in which we have f(ΔLR) = 0, and gL and gR are the slopes in the left and right outside regions, respectively. The three parameters lC, gL, and gR were determined by the left and right endpoints of the flat region (white circles) such that the discrepancy between the original and approximated functions is minimized within the region between the two vertical dotted lines under the condition that the approximated function and the original function coincide at the left and right endpoints of the approximated function (black circles). b Result for the approximation of f(ΔLR) in Fig. 3b under acceleration (Acc), deceleration (Dec), and mixed (Mix) conditions. c Mean and standard deviation of lC among the subjects, where “All” indicates the statistical result from all perturbation conditions. The dots along the bars represent data points (n = 8 for Acc and Dec, n = 6 for Mix, and n = 22 for “All”). d Mean and standard deviation of gL and gR among the subjects.
