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Biofeedback has been applied to many aspects of stroke rehabilitation, with mixed results. This is largely due to the varying modalities, differences between study designs, and methods of measuring success and progress. How well biofeedback works appears to be inversely related to the direct observability of the function about which information is being provided. The more covert the function (e.g., swallowing muscle activity, attention, cortical functioning, etc.), the more helpful biofeedback is likely to be. However, biofeedback in general can have a very positive impact, even through indirect means. Improvements in self confidence, shifting of locus of control, and instantly being provided information regarding changes in one’s physical functioning as a result of mental activity can be helpful in setting the tone for success in rehabilitation more generally. [ABSTRACT FROM AUTHOR]