Specific visual disability in relation to ontogeny of brain asymmetry.

Children with retarded development of visual perception were compared with previously tested normal children Verbal and non-verbal patterns were presented either to the left or to the right hemisphere. In both groups of children the results showed a functional equality of the hemispheres during analysis of the non-verbal patterns. Left hemisphere superiority for verbal material in Normal group was not confirmed by the results in Retarded children. The data are discussed in terms of the relation between the ontogeny of brain asymmetry and specific visual disability in children.