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. Author manuscript; available in PMC: 2018 Feb 26.
Published in final edited form as: IEEE Trans Neural Syst Rehabil Eng. 2016 Aug 26;25(8):1132–1142. doi: 10.1109/TNSRE.2016.2603340

Fig. 2.

Fig. 2

Group average spectrum of trunk, sacrum, and heel mediolateral motion for visually perturbed walking (Pairs 1-5, blue lines) compared to normal, unperturbed walking (black lines). Vertical dashed lines indicate the driving frequencies included in each visual perturbation: Pair 1 (0.05 and 0.155 Hz), Pair 2 (0.10 and 0.31 Hz), Pair 3 (0.20 and 0.62 Hz), Pair 4 (0.30 and 0.93 Hz), and Pair 5 (0.40 and 1.24 Hz). Asterisks (*) indicate significant difference between normal and visually perturbed walking at a given driving frequency (p<0.05). Carets (˄) and inverse Carets (˅) indicate significantly larger and smaller responses compared to both other anatomical positions at a given driving frequency, respectively (p<0.05).