One-week practice effects in older adults: tools for assessing cognitive change

Area of Science:

• Neuropsychology
• Cognitive Science
• Gerontology

Background:

• Evaluating cognitive change in patients is complex for neuropsychologists.
• Reliable change indices are crucial for accurate assessment of cognitive function over time.
• Existing methods may not fully capture short-term fluctuations in cognitive performance.

Purpose of the Study:

• To provide reliable change indices for commonly used neuropsychological measures in non-demented older adults.
• To examine cognitive changes over a short, one-week retest interval.
• To offer clinicians and researchers tools for assessing short-term cognitive variability.

Main Methods:

• Data collected from 167 non-demented older adults.
• Participants were administered a brief battery of neuropsychological tests twice within one week.
• Analysis included simple discrepancy scores, standard deviation index, reliable change index (with and without practice effect correction), and standardized regression-based change formulae.

Main Results:

• Statistically significant improvements were observed in seven out of nine cognitive scores.
• The most substantial changes were noted in memory-related measures.
• Various statistical indices for reliable change were calculated for each cognitive score.

Conclusions:

• The study provides valuable data on short-term cognitive changes in older adults.
• The developed reliable change indices can enhance the accuracy of neuropsychological assessments.
• These findings offer practical options for evaluating cognitive stability and change in diverse clinical and research settings.