Figure 2.

A, A significant placebo effect was found on heat-pain intensity ratings (left). No effect was found of time and learning (right). B, C, A significant placebo effect was found on hyperalgesic and allodynic areas (left). No effect was found of time and learning (right). Data are displayed as the median, interquartile range (box), 5–95% confidence intervals (leaf), and outliers (dots). †Session 1 ratings were not included in the statistical comparison because only 9 (of 19) ratings were obtained during this session.