Cognitive function and its change over time: effects on depression trajectories in oldest-old adults

Area of Science:

• Gerontology
• Cognitive Neuroscience
• Psychiatry

Background:

• Cognitive function and depressive symptoms are significant concerns in aging populations.
• Understanding the longitudinal relationship between cognition and depression is crucial for targeted interventions.

Purpose of the Study:

• To investigate how cognitive function and its longitudinal changes influence trajectories of depressive symptoms among oldest-old adults.
• To examine distinct developmental patterns in mid-to-late versus very late adulthood.

Main Methods:

• Latent growth curve modeling (LGCM) was used with data from the Health and Retirement Study (1992-2020).
• Analyses included participants aged 90-98+ and a comparative group aged 60-80.
• Covariates included gender, education, self-rated health, and activities of daily living (ADL).

Main Results:

• Higher baseline cognitive function was associated with lower baseline depressive symptoms.
• Changes in cognitive function did not predict changes in depressive symptoms among the oldest-old.
• Higher education, better ADL functioning, and better self-rated health predicted higher cognitive function and lower depression.
• Individuals with higher initial depressive symptoms experienced slower worsening over time.

Conclusions:

• Cognitive and emotional health are interrelated at baseline, but changes are not reliably linked in very old age.
• Education, physical functioning, and self-rated health are key predictors of cognitive and emotional well-being.
• Multidimensional assessments and targeted support are vital for promoting resilience in extreme old age.