Related Experiment Videos
Lateralisation of nociceptive processing in the human brain: a functional magnetic resonance imaging study
Paula D Youell1, Richard G Wise, Deborah E Bentley
1Human Pain Research Group, University of Manchester Rheumatic Diseases Centre, Hope Hospital, Salford M6 8HD, UK.
Neuroimage
|November 6, 2004
Summary
This study investigated brain lateralization in pain processing. Findings show distinct hemispheric roles in the lateral and medial pain systems, clarifying sensory-discriminative versus affective-motivational functions.
Area of Science:
- Neuroscience
- Pain Perception
- Brain Imaging
Background:
- Human pain processing involves parallel lateral and medial brain systems.
- The lateral system processes sensory-discriminative pain aspects.
- The medial system processes affective-motivational pain aspects.
Purpose of the Study:
- To clarify functional division between lateral and medial pain systems.
- To investigate hemispheric differences (lateralization) in brain activation during nociception.
Main Methods:
- Painful CO(2) laser stimuli applied to lower calves in five healthy subjects.
- 3-T functional magnetic resonance imaging (fMRI) measured blood oxygen level dependent (BOLD) signal changes.
- Analysis focused on somatosensory cortices (SI, SII), insula, and thalamus.
Main Results:
- No significant hemispheric difference in secondary somatosensory cortex (SII) activation.
- Greater activation in the left insula compared to the right.
- Contralateral activation in the primary somatosensory cortex (SI) and thalamus, supporting sensory-discriminative roles.
Conclusions:
- Hemispheric lateralization provides insights into distinct pain processing pathways.
- SI and thalamus show contralateral sensory-discriminative processing.
- Left insula may have a distinct role in pain processing.