Memory Deficits Precede Increases in Depressive Symptoms in Later Adulthood

Area of Science:

• Gerontology
• Cognitive Psychology
• Psychiatry

Background:

• Age-related cognitive decline and depression are prevalent in older adults.
• Understanding the temporal relationship between memory and mood is crucial for interventions.

Purpose of the Study:

• To investigate the bidirectional, time-ordered associations between age-related changes in depressive symptoms and memory.
• To determine if memory deficits precede increases in depression or vice versa.

Main Methods:

• Utilized data from 107,599 community-dwelling adults (aged 49-90) from the Survey of Health, Ageing, and Retirement in Europe (SHARE).
• Assessed depressive symptoms using the EURO-D inventory and memory via delayed recall of a 10-word list over five 2-year intervals.
• Employed dynamic structural equation models to analyze longitudinal and lead-lag relations.

Main Results:

• Both depressive symptoms and memory scores showed age-related worsening, particularly after age 62.
• A significant negative correlation (r = -.53) was found between long-term changes in depression and memory.
• Memory deficits at a given age predicted a 14.5% increased risk of depression two years later, even after adjusting for covariates.

Conclusions:

• Lower memory performance in later adulthood predicts subsequent increases in depressive symptoms over a 2-year period.
• This finding suggests a potential causal pathway where cognitive decline may contribute to mood disturbances in aging.