Age-related differences in brain activity despite matched cognitive performance: A moderated-mediation analysis.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Aging Research

Background:

• Individual differences in perceived task difficulty confound interpretation of cognitive brain activity.
• Age-related differences in brain activity may stem from perceived difficulty or neural resource recruitment variations.

Purpose of the Study:

• To investigate age-related differences in brain activity during a cognitive task, controlling for perceived difficulty.
• To explore the role of neural upregulation, reorganization, and suppression in cognitive aging.

Main Methods:

• Used functional magnetic resonance imaging (fMRI) during a verbal delayed match-to-sample task with titrated cognitive demands.
• Compared brain activity and behavioral performance between 40 younger and 39 older healthy adults.
• Applied the Reserve and Resilience Framework to analyze brain regions related to performance.

Main Results:

• No significant difference in titrated cognitive capacity between age groups, indicating equal task challenge.
• Significant differences in brain activity patterns between younger and older adults were observed.
• Relationships between brain activity and cognitive capacity varied by age group, supporting upregulation, reorganization, and suppression theories.

Conclusions:

• Brain activity modulation (increases and decreases) balances to maintain cognitive capacity in aging.
• Neural suppression appears to be a beneficial mechanism in healthy cognitive aging.
• The cognitive reserve and resilience framework should incorporate neural suppression.