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Related Experiment Videos

Pain processing within the primary somatosensory cortex in humans.

Koji Inui1, Xiaohong Wang, Yunhai Qiu

  • 1Department of Integrative Physiology, National Institute for Physiological Sciences, Myodaiji, Okazaki 444-8585, Japan. inui@nips.ac.jp

The European Journal of Neuroscience
|December 6, 2003
PubMed
Summary

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Noxious and innocuous stimuli processing in the brain

Area of Science:

  • Neuroscience
  • Somatosensory System
  • Brain Imaging

Background:

  • The primary somatosensory cortex (SI) processes sensory information, including touch and pain.
  • Understanding how the brain distinguishes between noxious (painful) and innocuous (non-painful) stimuli is crucial.

Purpose of the Study:

  • To investigate the neural processing of noxious and innocuous stimuli within the human primary somatosensory cortex (SI) and secondary somatosensory cortex (SII).
  • To compare the activation patterns and timings in SI and SII for different types of electrical stimulation.

Main Methods:

  • Magnetoencephalography (MEG) was used to record brain activity.
  • Noxious epidermal electrical stimulation (ES) and innocuous transcutaneous electrical stimulation (TS) were applied to the left hand.

Related Experiment Videos

  • Source localization techniques were employed to identify activated brain regions within SI and SII.

    • Main Results:

    • Both TS and ES activated the secondary somatosensory cortex (SII).
    • TS activated areas 3b and 1 in SI, with distinct temporal responses.
    • ES activated area 1 in SI but showed no detectable activation in area 3b, with later response latencies compared to TS.
    • SII activation occurred later for both stimulation types, with a more pronounced delay for noxious stimuli.

    Conclusions:

    • Noxious and innocuous stimulus processing shares similarities in SI and SII activation locations and timing.
    • A key difference lies in the lack of detectable SI area 3b activation by noxious stimuli.
    • These findings contribute to understanding the neural basis of pain perception and sensory discrimination.