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Ersoezlue, Ersin; Rauchmann, Boris-Stephan; Schneider-Axmann, Thomas; Wagner, Michael; Ballarini, Tommaso; Tato, Maia; Utecht, Julia; Kurz, Carolin; Papazov, Boris; Guersel, Selim; Burow, Lena; Koller, Gabriele; Stoecklein, Sophia; Keeser, Daniel; Bartels, Claudia; Brosseron, Frederic; Buerger, Katharina; Cetindag, Arda C.; Dechent, Peter; Dobisch, Laura; Ewers, Michael; Fliessbach, Klaus; Frommann, Ingo; Haynes, John D.; Heneka, Michael T.; Janowitz, Daniel; Kilimann, Ingo; Kleinedam, Luca; Laske, Christoph; Maier, Franziska; Metzger, Coraline D.; Munk, Matthias H.; Peters, Oliver; Preis, Lukas; Priller, Josef; Ramirez, Alfredo; Roeske, Sandra; Roy, Nina; Scheffler, Klaus; Schneider, Anja; Spottke, Annika; Spruth, Eike J.; Teipel, Stefan; Wiltfang, Jens; Wolfsgruber, Steffen; Yakupov, Renat; Duezel, Emrah; Jessen, Frank and Perneczky, Robert (2022): Lifelong experiences as a proxy of cognitive reserve moderate the association between connectivity and cognition in Alzheimer's disease. In: Neurobiology of Aging, Vol. 122: pp. 33-44

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Alzheimer's disease (AD) is associated with alterations in functional connectivity (FC) of the brain. The FC underpinnings of CR, that is, lifelong experiences, are largely unknown. Resting-state FC and structural MRI were performed in 76 CSF amyloid-beta (A beta) negative healthy controls and 152 A beta positive individ-uals as an AD spectrum cohort (ADS;55 with subjective cognitive decline, SCD;52 with mild cognitive impairment;45 with AD dementia). Following a region-of-interest (ROI) FC analysis, intrinsic network connectivity within the default-mode network (INC-DMN) and anti-correlation in INC between the DMN and dorsal attention network (DMN:DAN) were obtained as composite scores. CR was estimated by ed-ucation and Lifetime Experiences Questionnaire (LEQ). The association between INC-DMN and MEM was attenuated by higher LEQ scores in the entire ADS group, particularly in SCD. In ROI analyses, higher LEQ scores were associated with higher FC within the DMN in ADS group. INC-DMN remains relatively in-tact despite memory decline in individuals with higher lifetime activity estimates, supporting a role for functional networks in maintaining cognitive function in AD.(c) 2022 Elsevier Inc. All rights reserved.

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