ABSTRACT
For over two decades, the importance of studying adult intelligence within the context of sociocultural change has been recognized (Baltes, 1968; Riegel, 1976; Schaie, 1965). Empirical studies have focused primarily on the effect of cohort membership upon cognitive performance (Schaie, 1983). When individuals of different birth cohorts have been assessed at the same chronological age, the level of performance on a variety of psychometric ability measures has been shown to vary by birth cohort.
