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Memory Performance Index

Through a sophisticated analysis of working memory and short-term memory function, the Memory Performance Index (MPI) quantifies a patient's pattern of recall on a scaled range from 0-100 and classifies the score based on norms for the patient's demographic peer group.

This allows for intuitive comprehension of memory performance and aids monitoring of longitudinal change.

Compared to measures of total item recall, the MPI provides a more comprehensive measure of working and episodic memory. Data collected on over 30,000 normally aging subjects showed no correlation between age and total item recall. However, when MPI scores were plotted against age, a clear and consistent pattern emerged in accordance with age-related changes in memory function. This demonstrates the greater insight and clinical value of the MPI compared to simple measures of total item recall.