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Prefrontal gray matter volume mediates age effects on memory strategies
B A Kirchhoff1, B A Gordon2, D Head3
1Department of Psychology, Saint Louis University, St. Louis, MO 63103, USA.
Neuroimage
|January 7, 2014
Summary
Brain structure, specifically prefrontal gray matter, influences how adults use memory strategies. Age-related decline in these brain regions impacts semantic memory strategy use across the lifespan.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Gerontology
Background:
- Age-related memory decline is partly due to differences in spontaneous strategy use.
- The prefrontal cortex plays a crucial role in cognitive functions, including memory strategy selection.
Purpose of the Study:
- To investigate how prefrontal brain structure relates to age-related differences in self-initiated memory strategy use.
- To determine if prefrontal gray matter volume mediates the effects of age on memory strategy effectiveness.
Main Methods:
- Examined relationships between age, prefrontal gray matter volumes, and semantic/serial clustering during verbal recall.
- Utilized the California Verbal Learning Test-II (CVLT-II) across the adult lifespan.
- Employed mediation analyses to assess the role of gray matter volume.
Main Results:
- Semantic clustering negatively correlated with age and positively with bilateral middle and left inferior frontal gray matter volumes.
- Prefrontal gray matter volumes mediated the age effects on semantic clustering.
- Forward serial clustering also negatively correlated with age but not significantly with lateral prefrontal cortex gray matter.
Conclusions:
- Bilateral middle and left inferior frontal regions are critical for self-initiated semantic memory strategy use throughout adulthood.
- Reduced prefrontal gray matter volume contributes significantly to age-related declines in elaborative memory strategy use.
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