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Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...
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Related Experiment Video

Updated: Feb 7, 2026

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MEG-BMI to Control Phantom Limb Pain.

Takufumi Yanagisawa1,2,3,4, Ryohei Fukuma1,3, Ben Seymour5,6

  • 1Department of Neurosurgery, Osaka University Graduate School of Medicine.

Neurologia Medico-Chirurgica
|July 13, 2018
PubMed
Summary
This summary is machine-generated.

Brachial plexus root avulsion causes neuropathic pain, partly due to phantom limb sensations. Brain-machine interface training modulated sensorimotor cortex activity, reducing pain by reorganizing neural representations of phantom hand movements.

Keywords:
cortical plasticitymagnetoencephalographyneurofeedbackphantom limb painrobotic hand

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Area of Science:

  • Neuroscience
  • Pain Management
  • Rehabilitation Engineering

Background:

  • Brachial plexus root avulsion (BPRA) leads to intractable neuropathic pain, often resembling phantom limb pain.
  • This pain is hypothesized to stem from maladaptive plasticity in the sensorimotor cortex, but causal links remain unclear.

Purpose of the Study:

  • To investigate the role of sensorimotor cortical representation in BPRA-related pain.
  • To evaluate the efficacy of dorsal root entry zone (DREZotomy) and brain-machine interface (BMI) training in managing this chronic pain.

Main Methods:

  • A patient with BPRA underwent DREZotomy to alleviate shooting pain.
  • Real-time magnetoencephalography (MEG)-based BMI training was employed, allowing the patient to control a robotic hand using phantom hand movements.
  • The study analyzed changes in cortical representation and pain levels during BMI training.

Main Results:

  • DREZotomy reduced but did not eliminate shooting pain.
  • BMI training induced plastic changes in the sensorimotor cortex and decreased residual pain.
  • Actively engaging intact hand representations to control the robotic hand via phantom movements significantly reduced pain, despite lower movement classification accuracy.

Conclusions:

  • Phantom limb pain following BPRA is significantly influenced by sensorimotor cortical representation.
  • BMI training offers a novel therapeutic approach for chronic pain by inducing targeted cortical reorganization.
  • Further research is needed to understand and optimize methods for modulating cortical representation in pain management.