 As a second aim, we will use a multimodal MR scanning session to study the neurophysiological basis of sensory substitution in children. Under this aim we will pursue two main objectives. First, we will correlate the behavioral data with the imaging data in order to detect regions of the brain where structure andor function are associated with successful use of sensory substitution devices. Second, we will utilize these data along with previously collected adult data to model the effects of prior visual experience on visual cortex plasticity due to blindness. 