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. Author manuscript; available in PMC: 2008 May 2.
Published in final edited form as: IEEE Trans Neural Syst Rehabil Eng. 2007 Jun;15(2):173–181. doi: 10.1109/TNSRE.2007.896997

Fig. 3.

Fig. 3

Effect of secondary motor task (activated rigidity) on work W in ten PD patients off treatment (filled circles) and ten age-matched neurologically healthy control subjects (open squares). Means and s.e.m. (bars) are shown.