Memory for objects and faces by the mentally retarded and nonretarded.

Visual recognition skills of 26 mentally retarded high school students were compared with the skills of two groups of nonretarded students. All groups were taught to recognize 32 target faces and objects and were retested 1 week, 1 month, and 2 months later. The counterintuitive findings were that there were no significant differences between the retarded and nonretarded groups in memory for faces on any of the retest trials. All groups remembered faces significantly better than they did objects and remembered more of the pictures at 1 week than they did at 1 month or at 2 months. There was no significant loss over time in memory for faces. Relative to nonretarded subjects, the retarded subjects exhibited deficits in encoding and remembering objects but showed no such deficits in encoding and remembering faces. The results suggest that different configurational features may be used to encode objects as opposed to faces.