Performance variability during a multitrial list-learning task as a predictor of future cognitive decline in healthy...

Area of Science:

• Neuropsychology
• Gerontology
• Cognitive Science

Background:

• Neuropsychological testing traditionally relies on total summary scores (TSS).
• Intraindividual variability (IIV) indices offer unique information complementing TSS.
• This study investigates the predictive utility of IIV in older adults.

Purpose of the Study:

• To determine if IIV indices from the Rey Auditory Verbal Learning Test (RAVLT) incrementally predict cognitive decline.
• To compare the predictive power of IIV versus TSS in older adults.
• To assess the prognostic value of IIV in identifying individuals at risk for cognitive decline.

Main Methods:

• Longitudinal study of 99 cognitively intact older adults (65-89 years) over 18 months.
• RAVLT administered at baseline and follow-up.
• Logistic regression used to analyze baseline TSS and IIV indices (lost access, gained access) for predicting cognitive decline.

Main Results:

• Higher baseline IIV indices (lost access, gained access) were associated with increased risk of cognitive decline.
• IIV indices provided significant predictive utility beyond TSS.
• IIV analysis enhances the prediction of cognitive decline in older adults.

Conclusions:

• Analyzing IIV alongside TSS in neuropsychological evaluations is valuable for older adults.
• High IIV may indicate anterograde memory impairment or executive dysfunction.
• IIV serves as a prognostic indicator for cognitive decline.