Fig. 2.

Group differences in SIA. Thresholds and ratings before and after the stressor are depicted as mean and standard error of the mean. Patients with chronic musculoskeletal pain (CMP) are depicted with triangles and orange lines, healthy controls (HC) are depicted with circles and blue lines. Significant post hoc (corrected using the false discovery rate) differences are labeled with asterisks (*p < 0.05). Fig. 2a (top left) shows electric pain threshold before (pre) and after (post) the stressor, Fig. 2b (top right) shows electric pain tolerance before (pre) and after (post) the stressor, Fig. 2c (bottom left) shows pain intensity ratings in response to the test stimulus before (pre) and after (post) the stressor, Fig. 2d (bottom right) shows pain unpleasantness ratings in response to the test stimulus before (pre) and after (post) the stressor. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)