Most of the evidence for an age-related decline in intelligence came from

Question

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Cross-sectional research involves studying individuals of different ages at the same point in time, whereas longitudinal research follows individuals or groups over a period of time. Studies using cross-sectional research have often found age-related declines in intelligence, while studies using longitudinal research have found mixed findings or even some evidence for intellectual stability or gains in old age. Therefore, most of the evidence for an age-related decline in intelligence comes from cross-sectional research.

Most of the Evidence for an Age-Related Decline in Intelligence