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Brain, Vol. 126, No. 5, 1079-1091, May 2003
© 2003 Guarantors of Brain
doi: 10.1093/brain/awg102

Keeping pain out of mind: the role of the dorsolateral prefrontal cortex in pain modulation

J. Lorenz1,3,5, S. Minoshima4 and K. L. Casey1,2,3

Departments of 1 Neurology and 2 Physiology, University of Michigan, 3 Neurology Research Laboratories, Veterans Affairs Medical Center, Ann Arbor, MI, 4 Radiology Department, University of Washington, Seattle, WA, USA and 5 Institute of Physiology, University of Hamburg, Hamburg, Germany

Correspondence to: PD Dr med. Jürgen Lorenz, Institut für Neurophysiologie und Pathophysiologie, Universitätsklinikum Eppendorf Hamburg, Martinistrasse 52, D-20246 Hamburg, Germany E-mail: lorenz{at}uke.uni-hamburg.de

Frontal lobe activity during pain is generally linked to attentional processing. We addressed the question of whether ‘bottom-up’ processing and ‘top-down’ modulation of nociceptive information dissociate anatomically within the frontal lobe by using PET scanning during painful thermal stimulation of normal and capsaicin-treated skin. We showed recently that pain following normally non-painful heat stimuli on chemically irritated skin (heat allodynia) uniquely engages extensive areas of the bilateral dorsolateral prefrontal (DLPFC), ventral/orbitofrontal (VOFC) and perigenual anterior cingulate (ACC) cortices. Here, we applied principal component analysis (PCA) and multiple regression analysis to study the covariance structure of the volumes of interest (VOI) activated specifically during heat allodynia in 14 male healthy subjects and evaluated the relationship of these VOI to ratings of pain intensity and affect. Results yielded a primary principal component (PC) that correlated positively with intensity and unpleasantness and accounted for activity in the medial thalamus, bilateral anterior insula, ventral striatum, perigenual ACC and bilateral VOFC. Activities in the right and left DLPFC loaded on separate PC and correlated negatively with perceived intensity and unpleasantness. The inter-regional correlation of midbrain and medial thalamic activity was significantly reduced during high left DLPFC activity, suggesting that its negative correlation with pain affect may result from dampening of the effective connectivity of the midbrain–medial thalamic pathway. In contrast, right DLPFC activity was associated with a weakened relationship of the anterior insula with both pain intensity and affect. We propose that the DLPFC exerts active control on pain perception by modulating corticosubcortical and corticocortical pathways.


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