The sustained attention of 16 mildly retarded and 16 nonretarded adults was assessed during 2 60-minute vigilance tests differing in memory demand. Performance of retarded subjects declined more rapidly in later stages than did that of the nonretarded subjects. Implications for the study of memory load are discussed. (SLD)

Individual differences in performance on 4 computer-controlled visual memory and recognition tasks as a function of performance on 5 paper-and-pencil spatial tests were studied for 90 psychology students attending the University of Rennes (France). Results show that spatial thinking is partially supported by visual memory. (SLD)