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Acute plasticity in the human somatosensory cortex following amputation
D Borsook1, L Becerra, S Fishman
1MGH Pain Center, Massachusetts General Hospital, Harvard Medical School, Boston 02114, USA.
Neuroreport
|May 28, 1998
Summary
Immediately after arm amputation, sensory pathways reorganize rapidly. Brain imaging reveals significant changes in cortical activity correlating with phantom limb sensations, suggesting unmasking of existing neural inputs.
Area of Science:
- Neuroscience
- Neuroplasticity
- Sensory pathways
Background:
- Amputation leads to significant alterations in the nervous system.
- Understanding the timeline and mechanisms of sensory pathway reorganization is crucial.
Observation:
- Stimuli on the ipsilateral face were referred to specific points on the phantom limb within 24 hours post-amputation.
- Functional magnetic resonance imaging (fMRI) revealed objective signal changes in the brain one month after amputation.
Findings:
- Brush-evoked brain activity showed signal changes correlating with phantom hand perception.
- These findings in humans mirror immediate cortical plasticity observed in animal models.
Implications:
- Sensory pathways reorganize very rapidly following amputation in humans.
- This reorganization may involve the unmasking of previously silent neural inputs.
- The study provides insights into the neural basis of phantom limb phenomena.