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Anterior and posterior hippocampus macro- and microstructure across the lifespan in relation to memory-A longitudinal study.

Authors
  • Langnes, Espen1
  • Sneve, Markus H1
  • Sederevicius, Donatas1
  • Amlien, Inge K1
  • Walhovd, Kristine B1, 2
  • Fjell, Anders M1, 2
  • 1 Center for Lifespan Changes in Brain and Cognition, University of Oslo, Norway. , (Norway)
  • 2 Department of Radiology and Nuclear Medicine, Oslo University Hospital, Oslo, Norway. , (Norway)
Type
Published Article
Journal
Hippocampus
Publisher
Wiley (John Wiley & Sons)
Publication Date
Jul 01, 2020
Volume
30
Issue
7
Pages
678–692
Identifiers
DOI: 10.1002/hipo.23189
PMID: 31961464
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

There is evidence for a hippocampal long axis anterior-posterior (AP) differentiation in memory processing, which may have implications for the changes in episodic memory performance seen across development and aging. The hippocampus shows substantial structural changes with age, but the lifespan trajectories of hippocampal sub-regions along the AP axis are not established. The aim of the present study was to test whether the micro- and macro-structural age-trajectories of the anterior (aHC) and posterior (pHC) hippocampus are different. In a single-center longitudinal study, 1,790 cognitively healthy participants, 4.1-93.4 years of age, underwent a total of 3,367 MRI examinations and 3,033 memory tests sessions over 1-6 time points, spanning an interval up to 11.1 years. T1-weighted scans were used to estimate the volume of aHC and pHC (macrostructure), and diffusion tensor imaging to measure mean diffusion (MD, microstructure) within each region. We found that the macro- and microstructural lifespan-trajectories of aHC and pHC were clearly distinguishable, with partly common and partly unique variance shared with age. aHC showed a protracted period of microstructural development, while pHC microstructural development as indexed by MD was more or less completed in early childhood. In contrast, pHC showed larger unique aging-related changes. An aHC-pHC difference was also observed for volume, with pHC changing relatively more with higher age. All regions showed age-dependent relationships with episodic memory. aHC micro- and macrostructure was significantly related to verbal memory independently of age, but the relationships were still strongest among the older participants. We suggest that memory processes supported by each sub-region improve or decline in concert with volumetric and microstructural changes in the same age-period. Future research should disentangle the lifespan relationship between changes in these structural properties and different memory processes, encoding versus retrieval in particular, as well as other cognitive functions depending on the hippocampal long-axis specialization. © 2020 The Authors. Hippocampus published by Wiley Periodicals, Inc.

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