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Phantom digit somatotopy: a functional magnetic resonance imaging study in forearm amputees.

Björkman, Anders LU ; Weibull, Andreas LU ; Olsrud, Johan LU ; Ehrsson, Henrik; Rosén, Birgitta LU and Björkman-Burtscher, Isabella LU (2012) In European Journal of Neuroscience 36(1). p.2098-2106
Abstract
Forearm amputees often experience non-painful sensations in their phantom when the amputation stump is touched. Cutaneous stimulation of specific stump areas may be perceived as stimulation of specific phantom fingers (stump hand map). The neuronal basis of referred phantom limb sensations is unknown. We used functional magnetic resonance imaging to demonstrate a somatotopic map of the phantom fingers in the hand region of the primary somatosensory cortex after tactile stump stimulation. The location and extent of phantom finger activation in the primary somatosensory cortex corresponded well to the location of normal fingers in a reference population. Stimulation of the stump hand map resulted in an increased bilateral activation of the... (More)
Forearm amputees often experience non-painful sensations in their phantom when the amputation stump is touched. Cutaneous stimulation of specific stump areas may be perceived as stimulation of specific phantom fingers (stump hand map). The neuronal basis of referred phantom limb sensations is unknown. We used functional magnetic resonance imaging to demonstrate a somatotopic map of the phantom fingers in the hand region of the primary somatosensory cortex after tactile stump stimulation. The location and extent of phantom finger activation in the primary somatosensory cortex corresponded well to the location of normal fingers in a reference population. Stimulation of the stump hand map resulted in an increased bilateral activation of the primary somatosensory cortex compared with stimulation of forearm regions outside the stump hand map. Increased activation was also seen in contralateral posterior parietal cortex and premotor cortex. Ipsilateral primary somatosensory cortex activation might represent a compensatory mechanism and activation of the non-primary fronto-parietal areas might correspond to awareness of the phantom limb, which is enhanced when experiencing the referred sensations. It is concluded that phantom sensation elicited by stimulation of stump hand map areas is associated with activation of finger-specific somatotopical representations in the primary somatosensory cortex. This suggests that the primary somatosensory cortex could be a neural substrate of non-painful phantom sensations. The stump hand map phenomenon might be useful in the development of prosthetic hand devices. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Journal of Neuroscience
volume
36
issue
1
pages
2098 - 2106
publisher
Wiley-Blackwell
external identifiers
  • wos:000305903000014
  • pmid:22537316
  • scopus:84863189578
ISSN
1460-9568
DOI
10.1111/j.1460-9568.2012.08099.x
language
English
LU publication?
yes
id
0ea1f3a7-3375-4f60-b685-dac188591da0 (old id 2518961)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/22537316?dopt=Abstract
date added to LUP
2012-05-07 11:33:26
date last changed
2017-11-05 03:06:43
@article{0ea1f3a7-3375-4f60-b685-dac188591da0,
  abstract     = {Forearm amputees often experience non-painful sensations in their phantom when the amputation stump is touched. Cutaneous stimulation of specific stump areas may be perceived as stimulation of specific phantom fingers (stump hand map). The neuronal basis of referred phantom limb sensations is unknown. We used functional magnetic resonance imaging to demonstrate a somatotopic map of the phantom fingers in the hand region of the primary somatosensory cortex after tactile stump stimulation. The location and extent of phantom finger activation in the primary somatosensory cortex corresponded well to the location of normal fingers in a reference population. Stimulation of the stump hand map resulted in an increased bilateral activation of the primary somatosensory cortex compared with stimulation of forearm regions outside the stump hand map. Increased activation was also seen in contralateral posterior parietal cortex and premotor cortex. Ipsilateral primary somatosensory cortex activation might represent a compensatory mechanism and activation of the non-primary fronto-parietal areas might correspond to awareness of the phantom limb, which is enhanced when experiencing the referred sensations. It is concluded that phantom sensation elicited by stimulation of stump hand map areas is associated with activation of finger-specific somatotopical representations in the primary somatosensory cortex. This suggests that the primary somatosensory cortex could be a neural substrate of non-painful phantom sensations. The stump hand map phenomenon might be useful in the development of prosthetic hand devices.},
  author       = {Björkman, Anders and Weibull, Andreas and Olsrud, Johan and Ehrsson, Henrik and Rosén, Birgitta and Björkman-Burtscher, Isabella},
  issn         = {1460-9568},
  language     = {eng},
  number       = {1},
  pages        = {2098--2106},
  publisher    = {Wiley-Blackwell},
  series       = {European Journal of Neuroscience},
  title        = {Phantom digit somatotopy: a functional magnetic resonance imaging study in forearm amputees.},
  url          = {http://dx.doi.org/10.1111/j.1460-9568.2012.08099.x},
  volume       = {36},
  year         = {2012},
}