Impaired visual size-discrimination in children with movement disorders

► Young children do not integrate visual and haptic information: one sense is dominant. ► The dominance may reflect cross-sensory calibration by the more accurate sense. ► Non-sighted children show very poor haptic perception of orientation but not size. ► Children with movement disorders show poor visual perception of size but not orientation. ► This last result may reflect lack of cross-sensory calibration of vision by the haptic system.