Regional Cortical Thickness Predicts Top Cognitive Performance in the Elderly

Area of Science:

• Neuroscience
• Cognitive Aging
• Neuroimaging

Background:

• Aging is often linked to cognitive decline, but some individuals maintain high cognitive function.
• Previous research highlighted the cingulate cortex's role in exceptional cognitive abilities.
• Other brain regions like the prefrontal cortex and insula are also implicated in successful cognitive aging.

Purpose of the Study:

• To investigate the role of regional cortical thickness in both the cingulate cortex and the whole brain.
• To model Top Cognitive Performance (TCP), defined as performance in the top 50th percentile for memory and executive function.

Main Methods:

• Analysis of healthy subjects aged 70-100 years.
• Utilized data from the National Alzheimer's Coordinating Center and The 90+ Study.
• Compared the predictive accuracy of cingulate cortex thickness versus a whole-brain network approach for TCP.

Main Results:

• Cortical thickness in cingulate regions showed some accuracy in modeling TCP status.
• A whole-brain, network-level analysis significantly outperformed localized cingulate models in predicting TCP.
• This suggests that broader network properties are crucial for preserved cognition in older adults.

Conclusions:

• Preserved cognitive function in aging is associated with widespread brain network characteristics, not just localized regions.
• Future research should adopt network-centric approaches to better understand neurobiological factors supporting cognitive resilience.
• These findings advance our understanding of the neural underpinnings of successful cognitive aging.