The article reports two phases of a study that, through use of Piagetian reasoning assessments, indicated significant delays in the cognitive development of 75 congenitally blind students (6 to 18 years) compared to 75 sighted Ss. Developmentally appropriate reasoning experiences produced equivalent performance of blind Ss to that of the sighted…

Described are procedures used to assess reasoning in congenitally blind students. It is explained that the Piagetian Battery of Reasoning Assessments for concrete and formal or abstract thought measures the following basic abilities: reversability of thought, classifacatory thought, spatial orientation, and mental imagery. (CL)

Thirteen congenitally blind students (6-18 years old) who participated in a 2-year Piagetian-oriented remedial program experienced significant gains on 22 of 26 reasoning variables (as measured by a Piagetian battery), compared to a non-treatment group of Ss which achieved significant gains on seven of 26 variables. Results suggested the need for…