Fig. 4.

Percentage correct noun-verb tacts across experimental sessions for Iggy. Each panel shows data for each submatrix across baseline (BL) and differential reinforcement (DR) training sessions. Each data point depicts average percentage correct for all noun-verb combinations. Black data points reflect the three diagonal targets, whereas white data points reflect generalization targets. White triangular data points depict acquisition of generalization targets that did not meet mastery criteria in the recombinative generalization probe and required additional remedial training