Brain (re)organisation following amputation: Implications for phantom limb pain.

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Pain Research

Background:

• Arm amputation leads to sensory cortex reorganisation, potentially causing phantom limb pain (PLP).
• Brain activity during phantom limb movements correlates with PLP, suggesting preserved functional representation is key.
• Understanding cortical changes and their drivers is crucial for managing PLP.

Purpose of the Study:

• To review recent evidence on brain reorganisation following arm amputation.
• To explore factors influencing phantom limb representation and PLP.
• To discuss novel interventions and methodological advances for studying cortical changes.

Main Methods:

• Review of human neuroimaging studies.
• Analysis of perceptual, behavioral, and clinical factors.
• Discussion of augmented/virtual reality and brain-computer interface interventions.
• Consideration of high-field neuroimaging and multivariate techniques.

Main Results:

• Cortical reorganisation in S1 is linked to PLP, but other factors like phantom sensations and compensatory behaviors also play a role.
• Interventions targeting brain representation show promise in altering sensory changes and pain.
• Advanced neuroimaging techniques offer new ways to study somatosensory representations.

Conclusions:

• PLP involves complex interactions between S1 remapping, preserved limb representation, and contextual factors.
• Alleviating PLP requires considering mechanisms beyond S1 reorganisation.
• Future research should focus on the dynamic interplay of brain changes and contextual factors.