LAUSR

In a crossover design in volunteers, real electrical pain stimlation was given without warning and then with warning of pcoming pain. Also, warning was given without any pain stimuli to ollow, on one test followed by a gentle skin spray and one occasion ithout anything to follow at all. The numerical rating of pain was ecorded, as well as the concomitant change in oxygen deliveryonsumption balance, as measured by near-infrared technology in he forehead. As the verbal NRS scores of pain-intensity behaved redictively, increased similarly by both unexpected and expected eal pain and not by the other tests, the results of the BODCB were on-specific. Thus, disappointingly, BODCB appears not to be a new ethod for objective pain measurement. However, the results are still interesting as they demonstrate the mpact of expectations on brain neuronal activity, and that expecations can overrule the subjective pain-experience (as expressed y NRS) from real pain stimuli, in this kind of experiment [1].