The study compared the performance of 30 blind Chinese children in Taiwan, 34 blind Indian children, and 40 sighted Chinese children on 8 conservation tasks. Although both groups of blind children performed considerably poorer than sighted children, those blind children with considerable experience handling tangible materials performed better than…

Using Jean Piaget's theory of spatial development, a study was undertaken to identify the development of spatial concepts in 48 blind, partially sighted, and sighted 4-to-7-year-old children through the use of tactual recognition of shapes. (Author/PHR)

The study explored the concept of space through the tactual discrimination of household objects in 48 4-to-7-year-old blind, partially sighted, and sighted children. (PHR)

Various counting tasks were presented to 24 congenitally, totally blind children, aged 3-13, to determine the behaviors employed to ensure accurate counting. Three dimensions of tactile strategies were found, including "scanning,""organizing," and "partitioning." A developmental progression in the ontogenesis of each…