Similar to what LaBerge mentions... several of the books that I have on the human brain mention a study in which athletes were able to increase muscle size and strength by visualizing a weight lifting routine. The group that used only visualization was compared to a group that actually did the routine. If I remember correctly, the visualization group had something like a 20% gain in strength and size in comparison to the group that actually did the routine. Amazing that there was any gain at all! My hunch is that any type of visualization or LD training will improve a given task or skill. I have done some visualization work in the past and LDs are on a totally different level in terms of vividness and the sense of actually doing the task. I can only imagine that it would be a worthwhile venture to practice or train in an LD.