Distinct Components in the Right Extended Frontal Aslant Tract Mediate Language and Working Memory Performance: A Tractography-Informed VBM Study.
FAT
HCP
exFAT
extended frontal aslant tract
frontal aslant tract
language
voxel-based morphometry
working memory
Journal
Frontiers in neuroanatomy
ISSN: 1662-5129
Titre abrégé: Front Neuroanat
Pays: Switzerland
ID NLM: 101477943
Informations de publication
Date de publication:
2020
2020
Historique:
received:
28
11
2019
accepted:
26
03
2020
entrez:
7
5
2020
pubmed:
7
5
2020
medline:
7
5
2020
Statut:
epublish
Résumé
The extended frontal aslant tract (exFAT) is a tractography-based extension of the frontal aslant tract (FAT) which has been shown to be related with language and working memory performance in healthy human adults, but whether those functional implications map to structurally separate regions along its trajectory is still an open question. We present a tractography-informed Voxel-Based Morphometry procedure capable of detecting local tract-specific structural differences in white matter regions and apply it in two maximum variation sampling studies by comparing local differences in diffusion-derived microstructural parameters and fiber density along the exFAT territory between top performers and bottom performers in language and working memory tasks. In the right hemisphere we were able to detect, without prior constraints, a vertical frontal aslant component approximating the original FAT trajectory whose fiber density was significantly correlated with language (but not working memory) performance and an anterior cluster component corresponding to a distinct anterior frontal aslant component whose fiber density was significantly correlated with working memory (but not language) performance. The reported sub-division of the exFAT territory describes a set of frontal connections that are compatible with previously reported results on the Broca's territory and frontal cortex hierarchical organization along an anterior-posterior gradient, suggesting that the exFAT could be part of a common neuroanatomical scaffold where language and working memory functions are integrated in the healthy human brain.
Identifiants
pubmed: 32372922
doi: 10.3389/fnana.2020.00021
pmc: PMC7186483
doi:
Types de publication
Journal Article
Langues
eng
Pagination
21Informations de copyright
Copyright © 2020 Varriano, Pascual-Diaz and Prats-Galino.
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