Fig 1.

Six theoretical outcomes of dual-option response transfer tests. Each graph lists the six stimuli in a class on the abscissa with an asterisk above the stimulus that has become an S^D for a particular response. The ordinate indicates the likelihood of occurrence of that response in the presence of the remaining stimuli in the class. The graphs in each section indicate a representative theoretical pattern of responding that would indicate the form of control listed as the caption for that section.