Selective attrition and intraindividual variability in response time moderate cognitive change

Area of Science:

• Gerontology
• Cognitive Neuroscience
• Psychology

Background:

• Understanding aging-related cognitive change is crucial for identifying factors influencing cognitive decline.
• Time to attrition and intraindividual variability (IIV) in reaction time are emerging metrics sensitive to non-normative aging influences.

Purpose of the Study:

• To investigate time to attrition and IIV in reaction time as predictors of cognitive performance in older adults.
• To examine the association between reason for attrition and cognitive decline.

Main Methods:

• Longitudinal study of 304 community-dwelling older adults (aged 64-92 years) with annual assessments.
• Calculation of IIV from baseline reaction time tasks.
• Application of multilevel models to analyze cognitive change patterns and predictors.

Main Results:

• Time to attrition was significantly associated with cognitive decline.
• Greater IIV in reaction time predicted declines in executive functioning and episodic memory.
• Attrition due to personal health reasons correlated with decreased executive functioning.

Conclusions:

• Time to attrition serves as a valuable metric for characterizing cognitive change in aging.
• Reason for attrition and IIV are significant predictors of non-normative cognitive aging and potential cognitive loss.