--that central sensitization, which may happen after long term pain expsoure, in which there are trophic changes in brain/spinal cord neurons that keep firing even in the absence of noxious stimuli, and central pain syndrome, in which there is damage to the spinothalamic sensory relay tracts of the midbrain and stem areas, are not quite the same thing; different mechanisms are involved, though they may "feel" quite similar:

See:

www.centralpain.org

(I also wrote about this on your other thread, Craig--if I remember correctly, you have suffered from stroke, and that really makes me suspicious of central pain syndrome.)