Abstract
This chapter explains the intellectual functioning in midlife. Research findings from the Seattle Longitudinal Study serve as the primary database for this chapter. The focus of the SLS has been on individual change and generational differences in functioning on a set of basic mental abilities. These abilities have been studied primarily within a psychometric approach to cognition. The findings focus on six of these basic mental abilities: Vocabulary, Verbal Memory, Number, Spatial Orientation, Inductive Reasoning, and Perceptual Speed. The significant increase in level of functioning in early middle age suggests that experiences associated with early career development and the assumption of adult responsibilities (for example, managing finances) may contribute significantly to cognitive functioning.
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