Fig. 4. Representative maps of increased and decreased rCBF for the cold pain, heat pain, and ischemic pain condition based on the SPM analysis. Relative signal change are coded using the National Institutes of Health (NIH)-fire color scheme (upper bar ) for increase and the NIH-ice color scheme for rCBF reduction (lower bar ). BA = Brodmann area; rCBF = regional cerebral blood flow; SPM = statistical parametric mapping.