Fig 2. Performances in each experimental phase of the 8 subjects who passed the arbitrary stimulus categorization tests and the tact test given immediately following listener training with the arbitrary stimuli (namers/categorizers).

Numbers of arbitrary stimulus listener training trials to criterion are shown in the first column, followed in the next pair of columns (unfilled) by percent correct “zog” and “vek” responses in the tact test. Numbers of Pair 1 novel-function training trials to criterion are shown in the third column, followed in the next two column pairs by performance in the category transfer Test 1 (light gray) and the category transfer Test 2 (dark gray), respectively. For Subjects FJ and MH, performance in the category match-to-sample Test 1 is next shown (black) and, for FJ, performance on Test 2 and a repeat of Test 1 are also shown in the final pair of columns. The individual category mastery criterion on test trials is shown as a horizontal broken line.