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Related Experiment Videos

Brainstem involvement in the initial response to pain.

Predrag Petrovic1, Karl Magnus Petersson, Per Hansson

  • 1PET-Cognitive Neurophysiology, Department of Clinical Neuroscience, Karolinska Insitute, 171 76 Stockholm, Sweden. predrag.petrovic@ks.se

Neuroimage
|June 15, 2004
PubMed
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The brainstem and hypothalamus show increased activity during the initial phase of painful stimuli, correlating with a stronger sympathetic response. This suggests these areas are crucial for the early detection and reaction to acute pain.

Area of Science:

  • Neuroscience
  • Pain Research
  • Autonomic Nervous System

Background:

  • Autonomic responses to acute pain typically habituate quickly, unlike sustained subjective pain ratings.
  • The hypothalamus and brainstem are implicated in autonomic responses to pain and may attenuate responses during prolonged stimulation.
  • This aligns with the hypothesis that the brainstem plays a key role in the initial pain response.

Purpose of the Study:

  • To investigate the role of the brainstem in the initial response to prolonged painful stimulation.
  • To examine autonomic and brain activity changes during the early versus late phases of noxious cold stimulation.

Main Methods:

  • Positron emission tomography (PET) scans were used to measure brain activity during painful and non-painful cold stimulation.

Related Experiment Videos

  • Galvanic skin response (GSR) was recorded as a measure of autonomic sympathetic activity.
  • Subjects underwent prolonged tonic cold stimulation (cold pressor test) and non-painful cold stimulation.

    • Main Results:

    • Increased brain activity was observed in the thalamus, insula, and anterior cingulate cortex during painful stimulation.
    • Autonomic response (GSR) decreased over the duration of the stimulus.
    • Brainstem and hypothalamus activity increased during initial stimulation compared to late stimulation, particularly for painful stimuli.

    Conclusions:

    • The brainstem is involved in the initial response to noxious stimulation.
    • This early response is characterized by increased sympathetic activity.
    • Brainstem activity during pain shows specific covariation with cortical pain processing networks.