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Ikonic imagery in the severely subnormal.

Ability to reproduce and transpose matrices was studied in 23 adult SSN trainees. These subjects could transpose the matrices at a MA equivalent to the CA at which children normally do. The ability to reproduce the same matrices was not in evidence prior to the ability to transpose them, as it is in normal children. One possible interpretation of this finding is that cognitive development in SSNs is qualitatively different from that of normal children.