A group based in Heidelberg, Germany, has performed a pilot study using imagery of the neglected arm to treat visuospatial neglect. They trained 15 patients for an hour a day for 3 weeks, and found that imagining using the neglected arm improved copying/ drawing tasks and enhanced sensation in the arm.
Follow this link to the PubMed abstract.
Citation: Disabil Rehabil. 2011;33(21-22):2033-2043. Epub 2011 Feb 24.