Fig. 5From: On the effect of walking surface stiffness on inter-limb coordination in human walking: toward bilaterally informed robotic gait rehabilitationResponse of contralateral Tibialis Anterior. Averaged TA muscle activity for perturbed and unperturbed gait cycles at each of the four levels of BWS for a representative subject. Mean (darker lines) and standard deviation (lightly shaded areas) values are shown along with an indication of the timing of the perturbation. Statistically significant changes in perturbed gait cycles are indicated by a blue bar and a black asterisk. Heel-strike and toe-off of the right leg are indicated by HS and TO, respectivelyBack to article page