[A new assessment for episodic memory. Episodic memory test and caregiver's episodic memory test]

Area of Science:

• Neurology
• Cognitive Science
• Geriatrics

Background:

• Episodic memory impairment is a key indicator of early Alzheimer's disease (AD).
• Accurate and accessible screening tools are crucial for timely diagnosis and intervention.
• Existing methods may not be sufficiently sensitive or practical for widespread family use.

Purpose of the Study:

• To evaluate an episodic memory test for its feasibility, sensitivity, and specificity in identifying early-stage AD.
• To assess the utility of a caregiver-administered version of the test.

Main Methods:

• A 10-question episodic memory test was administered to 332 subjects, including those with Alzheimer's disease (AD), amnestic mild cognitive impairment (aMCI), and no cognitive impairment.
• Sensitivity and specificity were calculated to differentiate between AD, aMCI, and normal cognition.
• A caregiver-administered version was also evaluated.

Main Results:

• The test demonstrated high diagnostic accuracy, with an area under the ROC curve of 0.94 for aMCI and 0.99 for AD.
• Optimal cut-off scores identified high sensitivity and specificity: 89% sensitivity and 82% specificity for aMCI; 98% sensitivity and 91% specificity for AD.
• Caregiver administration yielded similar positive results.

Conclusions:

• The episodic memory test and its caregiver-administered version are effective brief screening tools for early-stage AD.
• The tests are suitable for primary care settings and home use by caregivers.
• Limitations include reliance on a reliable caregiver and focus solely on episodic memory.