The Ravens Standard Progressive Matrices Test was administered to 48 subjects who then performed a card-sorting task under single- and competing-task conditions. Hick's Law and the Roth-Jensen procedure were used in task development. Complexity should have a more central role in speed of processing models of intelligence than ability to divide…

Three studies compared learning and problem-solving performances of normal and familially-retarded children on tasks differing in complexity, and one study investigated motivational-personality differences. Main purpose of the first three studies was to investigate the controversy between developmental and defect theorists in mental retardation.…

This study of individual differences in performance of a geometric analogies task included four-alternative test items and studied eye movements and confidence judgments as well as latency and error. Results were interpreted using two hypothesized performance strategies: constructive matching and response elimination. (Author/BW)