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Related Concept Videos

Pain01:20

Pain

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...
Tension01:10

Tension

Tension is a force along the length of a medium, in particular, a force carried by a flexible medium, such as a rope or cable. The word "tension" comes from Latin, meaning "to stretch". Not coincidentally, the flexible cords that carry muscle forces to other parts of the body are called tendons. Any flexible connector, such as a string, rope, chain, wire, or cable, can exert pull only parallel to its length; so, a force carried by a flexible connector is a tension with a direction parallel to...
Blood and Nerve Supply to the Bones01:29

Blood and Nerve Supply to the Bones

Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
Analgesia and Pain Management01:25

Analgesia and Pain Management

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...
Nociception01:44

Nociception

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. Thus, pain helps the...
Factors Affecting Perception01:25

Factors Affecting Perception

Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
An illustrative example of a perceptual set is the scenario where an airline pilot told...

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Related Experiment Video

Updated: May 18, 2026

Quantifying Pain Location and Intensity with Multimodal Pain Body Diagrams
09:00

Quantifying Pain Location and Intensity with Multimodal Pain Body Diagrams

Published on: July 7, 2023

Pain, emotion, headache.

Gennaro Bussone1, Licia Grazzi, Alberto E Panerai

  • 1Neurological Institute C Besta, Milan, Italy.

Headache
|October 4, 2012
PubMed
Summary
This summary is machine-generated.

This review explores pain theories, differentiating acute pain from chronic pain. It highlights new research on chronic pain mechanisms, particularly migraine, using advanced imaging.

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Multi-Modal Signals for Analyzing Pain Responses to Thermal and Electrical Stimuli
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Multi-Modal Signals for Analyzing Pain Responses to Thermal and Electrical Stimuli

Published on: April 5, 2019

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Last Updated: May 18, 2026

Quantifying Pain Location and Intensity with Multimodal Pain Body Diagrams
09:00

Quantifying Pain Location and Intensity with Multimodal Pain Body Diagrams

Published on: July 7, 2023

Multi-Modal Signals for Analyzing Pain Responses to Thermal and Electrical Stimuli
09:16

Multi-Modal Signals for Analyzing Pain Responses to Thermal and Electrical Stimuli

Published on: April 5, 2019

Area of Science:

  • Neuroscience
  • Pain Research
  • Medical Imaging

Background:

  • Pain is traditionally viewed as a defense mechanism signaling immediate danger, fitting acute pain but not chronic pain.
  • Chronic pain persists without an active threat, leading to its classification as a separate condition from acute pain.
  • Understanding the distinct mechanisms of acute versus chronic pain is crucial for effective treatment.

Purpose of the Study:

  • To review historical and current theories of pain perception.
  • To illustrate various hypotheses regarding pain mechanisms.
  • To present and discuss emerging scientific data on chronic pain, with a focus on migraine, utilizing novel imaging techniques.

Main Methods:

  • Literature review of pain theories and historical perspectives.
  • Explanation of different hypotheses on pain mechanisms.
  • Analysis of recent scientific findings on chronic pain, including migraine, supported by innovative imaging data.

Main Results:

  • Traditional definitions of pain adequately describe acute pain but not chronic pain.
  • Chronic pain represents a distinct condition with unique underlying mechanisms.
  • Emerging research, particularly using advanced imaging, is providing new insights into chronic pain conditions like migraine.

Conclusions:

  • The distinction between acute and chronic pain is critical, as their underlying mechanisms differ significantly.
  • Innovative imaging techniques are advancing our understanding of chronic pain disorders.
  • Further research into chronic pain mechanisms is essential for developing targeted therapeutic strategies.