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Questions can be raised regarding the progress that has been achieved in accounting for the well-documented negative relations between chronological age during adulthood and fluid or process aspects of cognition. Advances in knowledge may have been limited in part because many researchers have ignored age-related influences that are common to a number of dependent variables. Two procedures are discussed that appear to have the potential to distinguish between general or common age-related influences and unique or specific age-related influences. Adoption of these or similar procedures is recommended to increase the cumulative nature of research and to facilitate integration of results from different research areas.
Timothy A. Salthouse (Fri,) studied this question.