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Age-related change in episodic memory: role of functional and structural connectivity between the ventral posterior cingulate and the parietal cortex

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Abstract

While the neural correlates of age-related episodic memory decline have been extensively studied, the precise involvement of the Posterior Cingulate Cortex (PCC) and posterior parietal cortex (the precuneus and the angular gyrus), remains unclear. The present study examined functional and structural neural correlates of age-related episodic memory change assessed over 12 years in 120 older adults (range 76–90 years). Episodic memory performance was measured using the Free and Cued Selective Reminding Test (FCSRT); functional connectivity metrics were computed from resting-state fMRI images and structural connectivity metrics were assessed through microstructural properties of reconstructed tract using a native space pipeline. We found that FCSRT change was significantly associated with the functional connectivity between the ventral PCC and three parietal regions, the ventral superior, the inferior part of the precuneus, and the rostro dorsal part of the angular gyrus. This association was independent of hippocampal volume. In addition, we found the that change in FCSRT scores was associated with fractional anisotropy of the tract connecting the ventral PCC and the ventral superior part of the precuneus. Change in episodic memory in aging was therefore related to a combination of high functional connectivity and low structural connectivity between the ventral PCC and the ventral superior part of the precuneus.

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Funding

This research was funded by the FONDATION VAINCRE ALZHEIMER (#14733). This study was also funded as an emerging project within the context of the laboratory of Excellence TRAIL ANR-10-LABX-57. The Three-City study is conducted under a partnership agreement between the Institut National de la Santé et de la Recherche Médicale (INSERM), the University Bordeaux 2 Victor Segalen and Sanofi-Aventis. The Fondation pour la Recherche Médicale funded the preparation and initiation of the study. The Three-City study is also supported by the Caisse Nationale Maladie des Travailleurs Salariés, Direction Générale de la Santé, MGEN, Institut de la Longévité, Conseils Régionaux d’Aquitaine et Bourgogne, Fondation de France, Ministry of Research-INSERM Programme “Cohortes et collections de données biologiques”, Agence Nationale de la Recherche ANR PNRA 2006 and LongVie 2007, the “Fondation Plan Alzheimer” (FCS 2009-2012) and the Caisse Nationale de Solidarité pour l’Autonomie (CNSA).

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Correspondence to Manon Edde.

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All procedures were conducted with approval from the ethics committee of Kremlin Bicêtre Hospital (Paris, France).

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Edde, M., Dilharreguy, B., Theaud, G. et al. Age-related change in episodic memory: role of functional and structural connectivity between the ventral posterior cingulate and the parietal cortex. Brain Struct Funct 225, 2203–2218 (2020). https://doi.org/10.1007/s00429-020-02121-7

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  • DOI: https://doi.org/10.1007/s00429-020-02121-7

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