Fig 1.

Mean attitudes (left) and intentions (right) to perform pro-organ donation behaviors across time and as a function of the humorous treatment for Study 1 (top) and Study 2 (bottom). In Study 1 (top), the humorous treatment positively affected attitudes and intentions compared with no treatment (T1 before the show, T2 immediately after the treatment), but the effect declined after four weeks (T3). In Study 2, the humorous treatment exerted similar positive effects as the neutral control treatment that delivered the same information about organ donation. Error bars are 95% confidence intervals. Numbers indicate n per group. Note that the y axis is cropped (range 1–7).