Developing an Objective Measure of Experienced Pain

"At the beginning of each study, participants are randomly allocated into one of two groups.~Within each group all participants are exposed to the same painful stimulus. One group experiences a painful stimulus of higher intensity compared to that of the other group. The painful stimuli are physically identical for every subject within the same group and within the standard of previous pain research.~Participants are then asked to evaluate the painful stimulus they just received according to a self-reported scale (NRS, VAS, gLMS, NRS-MB). Participants are also asked to decide multiple times whether they prefer a larger amount of money and experience the same or more painful stimulus they received before or a smaller amount of money and no (or a less) painful stimulus. The smaller amount of money is progressively increased across choices until it matches the larger amount, similar to multiple price-list methods (MPL) which are standard in economics."