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Related Experiment Videos

Reorganizational and perceptional changes after amputation

S Knecht1, H Henningsen, T Elbert

  • 1Department of Neurology, University of Münster, Germany.

Brain : a Journal of Neurology
|August 1, 1996
PubMed
Summary

Cortical reorganization after arm amputation causes referred sensations from face and trunk. This phantom limb pain reorganization correlates with nociceptive inputs and involves bilateral pathways, exceeding simple neighboring map shifts.

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Area of Science:

  • Neuroscience
  • Somatosensory research
  • Amputation studies

Background:

  • Cortical representational shifts occur after deafferentation in adult animals.
  • Hand representation is adjacent to face and trunk on the cortical homunculus.
  • This proximity suggests potential for sensory mislocalization to phantom limbs in amputees.

Purpose of the Study:

  • To investigate perceptual correlates of cortical reorganization in arm amputees.
  • To assess shifts in representational zones using magnetic source imaging.
  • To examine referred sensations from different body sites and modalities.

Main Methods:

  • Magnetic source imaging (MSI) was used to map cortical representational zones.
  • Eight adult arm amputees participated in the study.

Related Experiment Videos

  • Somaesthetic stimuli of various modalities were applied to standardized body sites (face, trunk).

    • Main Results:

    • Referred phantom sensations were evoked from ipsilateral and contralateral face and trunk sites.
    • The extent of cortical reorganization (via MSI) strongly correlated with the number of sites eliciting referred sensations.
    • Reorganization extent was closely linked to nociceptive inputs.

    Conclusions:

    • Cortical reorganization after amputation is significantly related to nociceptive inputs.
    • Referred sensations from both ipsilateral and contralateral sides suggest involvement of bilateral pathways.
    • Perceptual changes in amputees extend beyond simple shifts in adjacent cortical areas.