Age-related and genetic modulation of frontal cortex efficiency
Lars Nyberg1, Micael Andersson, Karolina Kauppi
1Umeå University.
Journal of Cognitive Neuroscience
|November 19, 2013
Summary
Brain imaging reveals that older adults and specific genetic variants show less efficient working memory processing in the dorsolateral prefrontal cortex (DLPFC). This suggests dopamine influences cognitive efficiency in aging and genetics.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- The dorsolateral prefrontal cortex (DLPFC) is crucial for working memory.
- DLPFC recruitment is thought to dynamically adjust with task demands.
- Low efficiency is indicated by high DLPFC activity for simple tasks and low activity for complex ones.
Purpose of the Study:
- To investigate the efficiency of DLPFC in working memory across aging and genetic variations.
- To examine the relationship between aging, COMT Val(158)Met status, and DLPFC BOLD signal during working memory tasks.
Main Methods:
- Functional magnetic resonance imaging (fMRI) BOLD signal was measured.
- Participants (n=287) performed working memory maintenance and manipulation tasks.
- Analysis considered age and catechol-O-methyltransferase (COMT) Val(158)Met genotype.
Main Results:
- Younger adults and COMT Met carriers showed peak DLPFC BOLD response during manipulation (high demand).
- Older adults and COMT Val carriers exhibited elevated DLPFC responses during maintenance (low demand).
- These inverted patterns support the DLPFC efficiency hypothesis.
Conclusions:
- Aging and COMT Val(158)Met genotype are linked to altered DLPFC efficiency in working memory.
- Findings suggest a connection between dopamine function and cognitive efficiency in the prefrontal cortex.
- The study provides evidence for differential neural recruitment strategies based on age and genetics.
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