Carried out by psychologists at the University of Sussex, the longitudinal study looked at data on more than 6,000 people taking part in the National Child Development Study, which was established in 1958 and followed participants from birth into childhood and through to adulthood.
The researchers measured symptoms of depression at ages 23, 33, 42 and 50, and memory, verbal fluency, information processing speed and accuracy at age 50., showed that one episode of depression or anxiety in early to mid-adulthood had little effect on the memory function of adults at age 50, regardless of which age the episode was experienced.
However, once the number of episodes increased to two or three over the three decades, the researchers found that there was a steady decrease in the participant's memory function at age 50. The researchers say the link between depression and memory loss suggests that depressive symptoms experienced in early adulthood could predict dementia later in life.
However, episodes of depression and anxiety appeared to have little impact on verbal fluency, information processing speed, and accuracy.
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