Article (Scientific journals)
Characterizing the gradients of structural covariance in the human hippocampus.
Kharabian Masouleh, Shahrzad; Plachti, Anna; Hoffstaedter, Felix et al.
2020In NeuroImage
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Abstract :
[en] The hippocampus is a plastic brain structure that has been associated with a range of behavioral aspects but also shows vulnerability to the most frequent neurocognitive diseases. Different aspects of its organization have been revealed by studies probing its different neurobiological properties. In particular, histological work has shown a pattern of differentiation along the proximal-distal dimension, while studies examining functional properties and large-scale functional integration have primarily highlighted a pattern of differentiation along the anterior posterior dimension. To better understand how these organizational dimensions underlie the pattern of structural covariance (SC) in the human hippocampus, we here applied a non-linear decomposition approach, disentangling the major modes of variation, to the pattern of grey matter volume correlation of hippocampus voxels with the rest of the brain in a sample of 377 healthy young adults. We additionally investigated the consistency of the derived gradients in an independent sample of life-span adults and also examined the relationships between these major modes of variations and the patterns derived from microstructure and functional connectivity mapping. Our results showed that similar major modes of SC-variability are identified across the two independent datasets. The major dimension of variation found in SC runs along the hippocampal anterior-posterior axis and followed closely the principal dimension of functional differentiation, suggesting an influence of network level interaction in this major mode of morphological variability. The second main mode of variability in the SC showed a gradient along the dorsal-ventral axis, and was moderately related to variability in hippocampal microstructural properties. Thus our results depicting relatively reliable patterns of SC variability within the hippocampus show an interplay between the already known organizational principles on the pattern of variability in hippocampus’ macrostructural properties. This study hence provides a first insight on the underlying organizational forces generating different co-plastic modes within the human hippocampus that may, in turn, help to better understand different vulnerability patterns of this crucial structure in different neurological and psychiatric diseases.
Disciplines :
Neurosciences & behavior
Author, co-author :
Kharabian Masouleh, Shahrzad
Plachti, Anna
Hoffstaedter, Felix
Eickhoff, Simon
Genon, Sarah ;  Université de Liège - ULiège > CRC In vivo Imaging-Aging & Memory
Language :
English
Title :
Characterizing the gradients of structural covariance in the human hippocampus.
Publication date :
2020
Journal title :
NeuroImage
ISSN :
1053-8119
eISSN :
1095-9572
Publisher :
Elsevier, United States - Florida
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 04 June 2020

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