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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. Thus, pain helps the...
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Age-related changes in nociceptive processing in the human brain.

Raimi L Quiton1, Steven R Roys, Jiachen Zhuo

  • 1Program in Neuroscience, University of Maryland, Baltimore, Maryland 21201, USA. rquiton@umaryland.edu

Annals of the New York Academy of Sciences
|April 7, 2007
PubMed
Summary

Older adults show reduced brain responses to pain, with smaller functional magnetic resonance imaging (fMRI) signals in key sensory areas like the anterior insula and primary somatosensory cortex compared to younger individuals.

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Area of Science:

  • Neuroscience
  • Pain Perception
  • Aging Research

Background:

  • Pain processing involves complex cortical networks.
  • Age-related changes in brain structure and function are well-documented.
  • Understanding how aging affects nociception is crucial for geriatric care.

Purpose of the Study:

  • To investigate age-related differences in cortical nociceptive processing.
  • To compare brain activity in response to painful stimuli between young and older adults.
  • To explore the relationship between brain structure and pain perception in aging.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
  • Painful contact heat stimuli were applied to assess nociceptive responses.
  • Participants included healthy young (ages 22-30) and older (ages 56-75) adults.
  • Gray matter volume was assessed in key brain regions.

Main Results:

  • Older adults exhibited significantly smaller pain-related fMRI responses in the anterior insula (aINS), primary somatosensory cortex (S1), and supplementary motor area compared to young adults.
  • Gray matter volumes were significantly reduced in the S1 and aINS of older subjects.
  • These structural reductions may underlie the diminished fMRI responses observed in older individuals.

Conclusions:

  • Aging is associated with attenuated cortical responses to painful stimuli.
  • Reduced gray matter volume in sensory processing regions may contribute to altered pain perception in older adults.
  • These findings highlight potential age-related changes in the neural mechanisms of pain.