Age changes in human abilities: A 28-year longitudinal study

32 Ss from a group of 485 White University of Southern California (USC) undergraduates who were tested on the Army Alpha Examination (AAE) in 1944 were retested in 1972. Comparisons were made between these Ss' early (A1) and later (A2) scores and those of a group (B) of 32 matched 1972 USC undergraduates. Results showed a 1 standard deviation (SD) decrement on the relations factor when A2 scores were compared to A1 and B but little difference between A1 vs B scores. On the verbal factor no differences were found between A2 and B, but when A1 vs A2 and A1 vs B were compared there was a one-half SD gain in favor of the later tests. On the number factor, females showed a 1 SD difference in favor of B when its scores were compared to those of A2 or A1. There were no differences for males on this factor. (5 ref)