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Related Experiment Videos

Movements modulate cortical activities evoked by noxious stimulation.

Hiroki Nakata1, Koji Inui, Toshiaki Wasaka

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

Pain
|January 13, 2004
PubMed
Summary
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Movement significantly alters brain responses to pain. Active hand movement reduces pain signals in the contralateral primary and secondary somatosensory cortices (SI and SII), while passive movement primarily affects cSI.

Area of Science:

  • Neuroscience
  • Pain Perception
  • Somatosensory System

Background:

  • Understanding how movement modulates pain processing is crucial for pain management.
  • Cortical activity following noxious stimulation provides insights into pain pathways.
  • The somatosensory cortex (SI and SII) plays a key role in processing touch and pain.

Purpose of the Study:

  • To investigate the effects of active and passive hand movements on cortical activity evoked by noxious laser stimulation.
  • To determine how movement influences activity in the contralateral and ipsilateral somatosensory cortices (SI and SII).
  • To explore the relationship between cortical activity changes and perceived pain intensity.

Main Methods:

  • Magnetoencephalography (MEG) was used to record brain activity in healthy volunteers.

Related Experiment Videos

  • Noxious YAG laser stimulation was applied to the dorsum of the left hand.
  • Participants performed active and passive movements of either the ipsilateral or contralateral hand.

    • Main Results:

    • Active ipsilateral hand movement significantly attenuated activity in contralateral SI and SII (cSI, cSII).
    • Active contralateral hand movement significantly attenuated cSII, but not cSI or ipsilateral SII (iSII).
    • Passive ipsilateral hand movement significantly attenuated cSI, with no effect on cSII or iSII.
    • Changes in Visual Analogue Scale (VAS) scores correlated with cSII amplitude changes.

    Conclusions:

    • Cortical processing of noxious stimuli is differentially modulated by active and passive movements.
    • Inhibition in cSI may result from interactions between ascending signals from stimulated and moving hands.
    • Inhibition in cSII is likely related to motor execution, attention, and potentially pain perception itself.