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. Author manuscript; available in PMC: 2014 Sep 18.
Published in final edited form as: IEEE Trans Neural Syst Rehabil Eng. 2004 Sep;12(3):360–366. doi: 10.1109/TNSRE.2004.834203

Figure 3.

Figure 3

Frequency spectrum of postural sway data shown in Figure 2 (0.25 Hz optic flow). Periodogram of postural sway data after pre-whitening filter was applied. Observe flatness of spectrum with peak at 0.25 Hz maintained.