Two aspects of the cognitive development of a 14- to 18-month-old blind child are reported: the development of procedures for the intentional control of objects and the development of certain classificatory skills. (Author)

The relationship between the development of object permanence and early words was studied in three young boys, two totally blind from birth and one severely visually impaired. Subjects acquired early words within the age range for sighted children but their word usage was different. The two blind children were delayed in their development of…

Twenty congenitally blind infants were placed in a panelled framework with various tactile and auditory objects for 20-minute periods. Results indicated that subjects improved their performance of spatially related activities when exposed to an environment helping them understand the concept and permanence of objects and the production of…

Development of object permanence skills was examined longitudinally in 20 visually impaired infants (ages 4-25 months). Order of skill acquisition and span of time required to master skills paralleled that of sighted infants, but the visually impaired subjects were 8-12 months older than sighted counterparts when similar skills were acquired.…