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- W4238974992 abstract "Abstract Background: The Cognitive Reserve (CR) theory posits that brains with higher reserve can cope with more cerebral damage to minimize clinical manifestations. The aim of this study was to examine the effect of education (CR proxy) on brain structure and function in Alzheimer’s disease (AD) and amnestic mild cognitive impairment (aMCI) patients and in cognitively healthy elderly (HC) individuals. Methods: Fifty-seven AD patients, 57 aMCI patients and 48 HCs were included to investigate the relationships between education years and gray matter volume (GMV), regional homogeneity (ReHo) and functional connectivity (FC) in brain regions to show associations with both structure and function. Taking the severity of the disease into account, we further assessed the relationships in AD stratified analyses. We then compared more highly (higher CR) and less highly educated (lower CR) subjects at the same level of cognitive impairment. Results: In AD group, the GMV of the dorsal anterior cingulate cortex (dACC) and ReHo in the left inferior temporal cortex (ITC) were inversely associated with education years, after adjustment for age, sex, Mini-Mental State Examination (MMSE), and total intracranial volume or head motion parameters. Seed-based FC analyses revealed that education years were negatively correlated with the FC between the left anterior ITC and left mid frontal cortex as well as right superior frontal cortex and right angular gyrus. Stratified analyses results indicated that this negative relation between education and GMV, ReHo, FC was mainly present in mild AD, which was attenuated in moderate AD and aMCI groups. In mild and moderate AD groups, subjects with higher CR had smaller regional GMV of the dACC and lower ReHo in the left ITC than the subjects with lower CR. No significant differences were found in severe AD and aMCI groups. Conclusions: Our results support the CR theory, and suggest that CR may be protective against AD related brain pathology at the early stage of clinical dementia. These findings could provide the locus of CR-related functional brain mechanisms and a specific time-window for therapeutic interventions to help AD patients to cope better with the brain pathological damage by increasing CR." @default.
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- W4238974992 date "2020-09-14" @default.
- W4238974992 modified "2023-09-24" @default.
- W4238974992 title "The Protective Impact of Education on Brain Structure and Function in Alzheimer’s Disease" @default.
- W4238974992 doi "https://doi.org/10.21203/rs.3.rs-73112/v1" @default.
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