For participants in middle adulthood, the seattle longitudinal study demonstrated that long-term memory for most through middle adulthood.

continues to increase for most through middle adulthood.

Explanation:

The Seattle Longitudinal Studyis considered as one of the most extensive psychological research studies of how adults develop and change through adulthood. According to my research on different memory studies, I can say that based on the information provided within the question The Seattle longitudinal study demonstrated that long term memory continues to increase for most through middle adulthood.

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