Experiment 1. Ordinates: median of ratings of appropriateness of various neurosurgical situations given by a group of subjects in Spranca et al. (1991); abscissae: median hedonic ratings of pleasure or displeasure given by our 12 subjects when presented with the same situations. The line indicates simple parametric regression to illustrate the relationship between both variables. Both Spearman and Kendall rank correlation coefficients indicated very significant correlation of the two variables.