POWERFUL TRAINING. “The induced activation caused VPL specific to the orientation. These results suggest that early visual areas are so plastic that mere inductions of activity patterns are sufficient to cause VPL. This technique can induce plasticity in a highly selective manner, potentially leading to powerful training and rehabilitative protocols.” (T. Watanabe et al.) (Visual perceptual learning, VPL)
http://science.sciencemag.org/content/334/6061/1413