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Structural whole-brain covariance of the anterior and posterior hippocampus: Associations with age and memory
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.ORCID iD: 0000-0003-0354-5228
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2018 (English)In: Hippocampus, ISSN 1050-9631, E-ISSN 1098-1063, Vol. 28, no 2, p. 151-163Article in journal (Refereed) Published
Abstract [en]

The hippocampus (HC) interacts with distributed brain regions to support memory and shows significant volume reductions in aging, but little is known about age effects on hippocampal whole-brain structural covariance. It is also unclear whether the anterior and posterior HC show similar or distinct patterns of whole-brain covariance and to what extent these are related to memory functions organized along the hippocampal longitudinal axis. Using the multivariate approach partial least squares, we assessed structural whole-brain covariance of the HC in addition to regional volume, in young, middle-aged and older adults (n = 221), and assessed associations with episodic and spatial memory. Based on findings of sex differences in both memory and brain aging, we further considered sex as a potential modulating factor of age effects. There were two main covariance patterns: one capturing common anterior and posterior covariance, and one differentiating the two regions by capturing anterior-specific covariance only. These patterns were differentially related to associative memory while unrelated to measures of single-item memory and spatial memory. Although patterns were qualitatively comparable across age groups, participants' expression of both patterns decreased with age, independently of sex. The results suggest that the organization of hippocampal structural whole-brain covariance remains stable across age, but that the integrity of these networks decreases as the brain undergoes age-related alterations.

Place, publisher, year, edition, pages
2018. Vol. 28, no 2, p. 151-163
Keywords [en]
aging, episodic memory, longitudinal axis, sex, spatial memory
National Category
Neurology
Identifiers
URN: urn:nbn:se:uu:diva-335505DOI: 10.1002/hipo.22817PubMedID: 29171897OAI: oai:DiVA.org:uu-335505DiVA, id: diva2:1163250
Available from: 2017-12-06 Created: 2017-12-06 Last updated: 2018-05-09Bibliographically approved
In thesis
1. Aging Along the Hippocampal Axis: Structure, Function and Whole-brain Connections in Association with Memory
Open this publication in new window or tab >>Aging Along the Hippocampal Axis: Structure, Function and Whole-brain Connections in Association with Memory
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Hippocampus-dependent functions display marked reductions in older age, an observation that has led to the extensive study of age effects on hippocampal properties. Even though research indicates that the hippocampus is structurally and functionally heterogeneous along its longitudinal axis, its anterior and posterior regions differentially supporting episodic and spatial memory representations, few studies explicitly consider age effects in relation to axis. Relatedly, as men and women commonly differ in episodic and spatial memory performance, and sometimes also in rates of age-related hippocampal atrophy, sex could be a potential modifier of age effects. The aim of this thesis was therefore to assess age effects on the hippocampus and its role in episodic and spatial memory across young (20-35 years), middle-aged (40-50 years) and older (60-70 years) adults, adopting a longitudinal-axis approach while considering interactions with sex. Study I evaluated hippocampal volume and activation in relation to associative memory across middle-aged and older adults. Age differences in associative memory were largest in men and paralleled by smaller volumes and less activation in the anterior hippocampus. Study II assessed hippocampus-dependent network-like organization of gray matter by measures of structural whole-brain covariance. The anterior and posterior hippocampus showed shared and distinct patterns of covariance, which were qualitatively comparable across age groups. However, participants’ expression of these patterns decreased as a function of age, comparably for men and women, and showed significant associations with episodic memory. Study III investigated age effects on resting-state functional connectivity and demonstrated that both the anterior and posterior hippocampus decreased in connectivity with several brain regions across middle-aged and older adults. Memory was only associated with age-related connectivity of the posterior hippocampus: episodic memory negatively with connectivity increasing as a function of age, and spatial memory positively with connectivity that decreased. These studies demonstrate distinct effects of age on the anterior and posterior hippocampus, and show that age-related decline of these regions differentially relates to episodic and spatial memory. Overall, findings highlight the importance of explicitly considering the heterogeneity of the hippocampal axis in the assessment of its role in age-related memory decline.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 79
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Social Sciences, ISSN 1652-9030 ; 154
Keywords
hippocampus, aging, longitudinal-axis, episodic memory, spatial memory, connectivity, fMRI
National Category
Psychology
Research subject
Psychology
Identifiers
urn:nbn:se:uu:diva-348686 (URN)978-91-513-0339-0 (ISBN)
Public defence
2018-06-08, Auditorium Minus, Museum Gustavianum, Akademigatan 3, Uppsala, 14:15 (English)
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Available from: 2018-05-14 Created: 2018-04-17 Last updated: 2018-05-14

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Nordin, KristinPersson, JonasStening, EvaLarsson, Elna-MarieSöderlund, Hedvig

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