Complex pattern of facial remapping in somatosensory cortex following congenital but not acquired hand loss.
cortical remapping
fMRI
face somatotopoy
human
neuroscience
phantom limb pain
primary somatosensory cortex
Journal
eLife
ISSN: 2050-084X
Titre abrégé: Elife
Pays: England
ID NLM: 101579614
Informations de publication
Date de publication:
30 12 2022
30 12 2022
Historique:
received:
06
12
2021
accepted:
29
12
2022
pubmed:
31
12
2022
medline:
24
1
2023
entrez:
30
12
2022
Statut:
epublish
Résumé
Cortical remapping after hand loss in the primary somatosensory cortex (S1) is thought to be predominantly dictated by cortical proximity, with adjacent body parts remapping into the deprived area. Traditionally, this remapping has been characterised by changes in the lip representation, which is assumed to be the immediate neighbour of the hand based on electrophysiological research in non-human primates. However, the orientation of facial somatotopy in humans is debated, with contrasting work reporting both an inverted and upright topography. We aimed to fill this gap in the S1 homunculus by investigating the topographic organisation of the face. Using both univariate and multivariate approaches we examined the extent of face-to-hand remapping in individuals with a congenital and acquired missing hand (hereafter one-handers and amputees, respectively), relative to two-handed controls. Participants were asked to move different facial parts (forehead, nose, lips, tongue) during functional MRI (fMRI) scanning. We first confirmed an upright face organisation in all three groups, with the upper-face and not the lips bordering the hand area. We further found little evidence for remapping of both forehead and lips in amputees, with no significant relationship to the chronicity of their phantom limb pain (PLP). In contrast, we found converging evidence for a complex pattern of face remapping in congenital one-handers across multiple facial parts, where relative to controls, the location of the cortical neighbour - the forehead - is shown to shift away from the deprived hand area, which is subsequently more activated by the lips and the tongue. Together, our findings demonstrate that the face representation in humans is highly plastic, but that this plasticity is restricted by the developmental stage of input deprivation, rather than cortical proximity.
Identifiants
pubmed: 36583538
doi: 10.7554/eLife.76158
pii: 76158
pmc: PMC9851617
doi:
pii:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : European Research Council
ID : 715022
Pays : International
Organisme : Medical Research Council
ID : MC_UU_00030/10
Pays : United Kingdom
Organisme : Wellcome Trust
ID : 215575/Z/19/Z
Pays : United Kingdom
Informations de copyright
© 2022, Root, Muret et al.
Déclaration de conflit d'intérêts
VR, DM, MA, EA, JT, AT, IT No competing interests declared, TM Senior editor, eLife
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