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ISSN : 1226-9654
The role of education on the relationship between verbal episodic memory and gray matter volumes in Korean elderly women
Abstract
According to the cognitive reserve hypothesis, more educated older adults are less susceptible to age-related or pathological cognitive changes due to accumulated resources necessary for various cognitive tasks. Although previous studies have validated the concept of cognitive reserve, it remains elusive how the early experience of education alters the relationship between regional gray matter volume and episodic memory performance. The present work examined Elderly Verbal Learning Test (EVLT) and structural Magnetic Resonance Imaging within 54 healthy older women. Education groups were divided into low (n = 27, mean education = 2.44) and middle (n = 27, mean education = 8.48) groups. We tested each group’s correlations between regional gray matter volume and memory performances using the voxel-based morphometry (VBM) method and compared whether the correlations between the two groups differ. We found that regional volumes of the medial temporal lobe and orbitofrontal cortex highly correlated with EVLT performance among low education group, whereas the precuneus and inferior parietal lobule volumes were specifically associated with better memory performance among the middle education group. These results indicate that the neuroanatomical substrates contributing to better memory performance differ depending on the years of education, in concert with the protective effect of cognitive reserve.
- keywords
- 교육 경험, 인지 예비능, 회백질 부피, 인지 노화, 일화기억, education, cognitive reserve, gray matter volume, cognitive aging, episodic memory
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