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Updated: May 22, 2026
08:05
Electrophysiological Methods to Assess Peripheral Pain Block in an Anesthetized Rat
Published on: November 21, 2025
Attention modulates spinal cord responses to pain
Christian Sprenger1, Falk Eippert, Jürgen Finsterbusch
1Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany. c.sprenger@uke.de
Current Biology : CB
|May 22, 2012
Summary
Mental distraction reduces pain by inhibiting spinal cord signals. This pain relief mechanism involves endogenous opioids and is confirmed by functional MRI and naloxone studies.
Area of Science:
- Neuroscience
- Pain Research
- Cognitive Neuroscience
Background:
- Cognitive processes like distraction can alter pain perception.
- Previous studies indicated brain-based modulation of pain, but the exact mechanism was unknown.
Purpose of the Study:
- To investigate the neuronal mechanism of pain reduction during mental distraction.
- To determine if spinal cord processes are involved in cognitive pain modulation.
Main Methods:
- High-resolution functional MRI of the cervical spinal cord during thermal pain and a working memory task.
- Behavioral pain assessment.
- Pharmacological intervention using the opioid antagonist naloxone.
Main Results:
- Painful stimuli evoked reduced neuronal responses in the spinal cord dorsal horn under high working memory load.
- Spinal cord response reduction correlated with decreased pain perception.
- Naloxone significantly blocked the pain-reducing effect of distraction.
Conclusions:
- Reduced pain perception during mental distraction is mediated by spinal cord inhibition.
- Endogenous opioid neurotransmission plays a crucial role in this pain modulation pathway.
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