Abstract and Keywords
Longitudinal studies provide a rich resource for understanding the development of mental disorders and cognitive impairment in adulthood and ageing. This chapter outlines the characteristics and strengths of longitudinal research, and its methodological considerations, and then describes the contribution of longitudinal research to three domains: cognitive disorders, depression, and anxiety. Key areas where longitudinal studies have contributed to geropyschology include the documentation of the natural history of disorders, their prevalence and incidence, and predictors of onset and recovery.
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