C.M. and B.H. contributed equally to this work.
Secondary somatosensory cortex is important for the sensory-discriminative dimension of pain: a functional MRI study
Article first published online: 8 MAR 2006
European Journal of Neuroscience
Volume 23, Issue 5, pages 1377–1383, March 2006
How to Cite
Maihöfner, C., Herzner, B. and Otto Handwerker, H. (2006), Secondary somatosensory cortex is important for the sensory-discriminative dimension of pain: a functional MRI study. European Journal of Neuroscience, 23: 1377–1383. doi: 10.1111/j.1460-9568.2006.04632.x
- Issue published online: 23 MAR 2006
- Article first published online: 8 MAR 2006
- Received 20 July 2005, revised 13 December 2005, accepted 16 December 2005
- functional MRI;
- pain pathways;
- sensory systems;
- somatosensory system
A complex cortical network is believed to encode the multidimensionality of the human pain experience. In the present study, we used functional magnetic resonance imaging (fMRI) to examine whether the brain's processing of noxious stimuli differs with different psychophysical properties. Painful mechanical impact and heat stimulations of equal stimulus intensity were applied to the forearm of 14 subjects in a randomized order. Concomitantly, subjects had to evaluate the corresponding sensory-discriminative and affective-motivational pain dimensions. fMRI revealed an increased activation of bilateral secondary somatosensory cortices (S2) during mechanical impact pain compared with heat pain. Activations in S2 were significantly correlated with scores for the sensory-discriminative component during mechanical impact pain. By contrast, corresponding scores for the affective-motivational pain dimension did not differ between both conditions. In summary, we conclude that S2 plays an important role in the sensory-discriminative dimension of pain.