Neuropsychological measures in normal individuals that predict subsequent cognitive decline

Area of Science:

• Neuroscience
• Gerontology
• Cognitive Psychology

Background:

• Cognitive decline is a significant concern in aging populations.
• Identifying early predictors of cognitive decline is crucial for timely intervention.
• Neuropsychological measures offer potential biomarkers for cognitive trajectory.

Purpose of the Study:

• To identify neuropsychological measures that predict the time to cognitive decline in normal individuals.
• To examine predictors of progression from normal cognition to mild cognitive impairment (MCI).
• To investigate predictors of progression from MCI to Alzheimer's disease (AD).

Main Methods:

• A cohort of 107 cognitively normal and 235 MCI individuals were followed for approximately 5 years.
• Six neuropsychological tests assessed cognitive performance at baseline.
• Cox proportional hazards models analyzed the time to progression between cognitive states.

Main Results:

• Lower episodic memory scores predicted a higher risk of progression from normal cognition to MCI (HR=0.55, P<.001).
• Carrying the apolipoprotein E epsilon2 allele was associated with a lower risk of cognitive decline (HR=0.13, P=.006).
• Episodic memory and executive function predicted progression from MCI to AD (e.g., HR=0.67, P=.005 for memory; HR=1.40, P=.007 for executive function).

Conclusions:

• Episodic memory performance is a key predictor of progression to mild impairment.
• Apolipoprotein E epsilon2 status is linked to a reduced risk of cognitive decline in normal individuals.
• Both episodic memory and executive function predict progression from mild impairment to Alzheimer's disease.