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Related Concept Videos

Pain01:20

Pain

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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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Nociception01:44

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Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.
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Local Anesthetics: Differential Sensitivity of Nerve Fibers01:24

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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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Analgesia and Pain Management01:25

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Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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Related Experiment Video

Updated: Mar 14, 2026

Optimizing Photoneuromodulation Techniques to Evaluate the Role of Green Light-Emitting Diodes in Pain Management
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Probing pain pathways with light.

Feng Wang1, Erik Bélanger2, Marie-Eve Paquet3

  • 1Institut universitaire en santé mentale de Québec, Université Laval, Québec, QC, Canada.

Neuroscience
|October 6, 2016
PubMed
Summary

Photonics technologies are advancing pain research by enabling neuron monitoring and circuit analysis. New light-sensitive probes and delivery strategies overcome challenges in accessing pain pathways for better understanding and clinical translation.

Keywords:
fiber-opticsnociceptive processingnonlinear microscopyoptogeneticsoptrodes

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Optogenetics

Background:

  • Photonics technologies have rapidly advanced for neural circuit research, but their application in pain research is nascent.
  • Key pain pathway sites like the skin, spinal cord, and brainstem are difficult to access with existing photonic techniques due to light scattering and tissue movement.
  • This limits the ability to study the neural basis of pain and translate findings into clinical applications.

Purpose of the Study:

  • To review recent advances in photonic tools for pain research.
  • To discuss challenges and strategies for accessing pain pathways with light.
  • To explore opportunities for novel imaging and multimodal interrogation in pain neuroscience.

Main Methods:

  • Review of recent advances in light-sensitive molecular probes (sensors and actuators) for pain circuits.
  • Discussion of strategies to overcome hardware access challenges (light scattering, tissue movement).
  • Exploration of novel imaging modalities and in vivo multimodal interrogation techniques.

Main Results:

  • Development of advanced light-sensitive molecular probes for pain pathway interrogation.
  • Strategies to effectively deliver light to and collect signals from deep or difficult-to-access pain structures.
  • Emerging novel imaging modalities for label-free chemical detection and multimodal in vivo studies.

Conclusions:

  • Recent advances in photonics offer unprecedented opportunities to study pain pathways at cellular and circuit levels.
  • Overcoming technical challenges in light delivery and signal detection is crucial for deciphering nociceptive signal encoding.
  • Bridging cellular studies with behavioral testing is essential for translating pain research findings into clinical applications.