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...Slideshow project doi jrrd jsp aim determine whether force produced by voluntary effort and functional electrical stimulation fes add together independently of or increment in depends on level relevance may augment arm hand movement poststroke neuroprostheses incorporating must consider how forces combine order to provide appropriate this article any supplementary material should be cited as follows makowski p knutson j chae crago interaction neuromuscular rehabil res dev http dx org method participants performed isometric matching tasks under different combinations reached steady while they attempted maintain constant was applied results decreases initial increases conclusion potential mechanisms causing change output are proposed but relative contribution each mechanism is unknown...