Three experiments investigated the possibility that adult age differences on block design tasks originate because of reduced efficiency with increased age in the cognitive processes associated with block manipulation. Older adults were substantially slower and less efficient than younger adults in performing tasks with minimized design…

To analyze the hypothesis that retest gain scores would decrease in a decelerating curve to zero-gain as the retest interval increased, male college students were administered the WAIS on two occasions with a retest at either 1 week, 2 months, or 4 months. (Author/SJL)

IN THIS STUDY ON THE EFFECTS OF STRUCTURE AND SEQUENCE ON ADULT LEARNING, 96 ADULTS UNFAMILIAR WITH NUMBER BASES AND RANGING IN AGE FROM 23 TO 53 WERE RANDOMLY ASSIGNED TO FOUR DIFFERENTIALLY STRUCTURED INTRODUCTORY MATERIALS (HISTORY OF MEASUREMENT, BASE TEN, BASE SEVEN, OR PRINCIPLES OF NUMBER BASES) AND TO THREE DIFFERENTIALLY SEQUENCED…