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Related Concept Videos

The Placebo Effect01:54

The Placebo Effect

The placebo effect occurs when people's expectations or beliefs influence or determine their experience in a given situation. In other words, simply expecting something to happen can actually make it happen.
Blind Procedures02:07

Blind Procedures

Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...
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...
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...
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...
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...

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Related Experiment Video

Updated: Jul 16, 2026

How to Study Placebo Responses in Motion Sickness with a Rotation Chair Paradigm in Healthy Participants
08:50

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Published on: December 14, 2014

[Placebo effect and pain: brain bases].

J M J Ramos1

  • 1Departamento de Psicología Experimental y Fisología del Comportamiento, Facultad de Psicología, Universidad de Granada. jmjramos@ugr.es

Neurologia (Barcelona, Spain)
|February 27, 2007
PubMed
Summary

The placebo effect in pain relief involves prefrontal cortex activation for pain control. This system then reduces pain signaling in brain regions like the insula and cingulate cortex, mediated by opioids.

Area of Science:

  • Neuroscience
  • Psychology
  • Pharmacology

Context:

  • Pharmacological treatments are influenced by psychosocial factors.
  • The placebo effect demonstrates improvement from simulated treatment due to psychosocial context.
  • Understanding placebo analgesia requires examining its neural underpinnings.

Purpose:

  • To investigate the brain regions and neurochemical mechanisms behind placebo-induced analgesia.
  • To elucidate the neural pathways involved in placebo pain relief.

Summary:

  • Functional neuroimaging reveals increased dorsolateral and orbitofrontal prefrontal cortex activity during placebo analgesia, suggesting a role in cognitive pain control.
  • Placebo administration leads to reduced activity in the anterior insula and rostral cingulate cortex during nociceptive stimulation.

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Last Updated: Jul 16, 2026

How to Study Placebo Responses in Motion Sickness with a Rotation Chair Paradigm in Healthy Participants
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Published on: December 14, 2014

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Determining Pain Detection and Tolerance Thresholds Using an Integrated, Multi-Modal Pain Task Battery

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  • Opioid release appears to mediate the attenuation of pain processing in these key cortical regions.

    • Impact:

    • Identifies distinct cerebral systems, a prefrontal guiding mechanism and downstream cortical regions, working in concert for placebo analgesia.
    • Highlights the brain's capacity to modulate pain perception through expectation and psychosocial context.
    • Provides insights into the neurobiological basis of placebo effects, relevant for pain management strategies.