When the performance of congenitally blind children with and without retrolental fibroplasia was compared on a number of cognitive and spatial tasks, no significant differences were found. The results lend no support to the view that children with retrolental fibroplasia have greater deficits than do other congenitally blind children. They suggest, rather, that the amount of early experiences in the environment is responsible for the successful performance of these tasks and that mental and spatial problem solving may depend on different psychological processes.
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