Abstract
The concept of developmentally delayed children was introduced in the Soviet defectological literature in 1966 with the publication of M. Pevzner's book entitled Children with Developmental Deviations. This column reviews recent studies that compare the clinical characteristics of developmentally delayed, mentally retarded, and average children. A number of Soviet defectologists have studied attention, memory, and intellectual functioning of developmentally delayed children, as well as educational potential and performance. Verbal facility of developmentally delayed children has been reported by numerous investigators as being inferior to that of average children. The Soviet defectological literature indicates that students called developmentally delayed are in many respects similar to those called learning disabled in the United States.
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