“…Likewise, generalization between responses (from B 1 to B 2 and vice versa) is quantified by d br , which also ranges from 1 to ∞. Manipulations that degrade stimulus or contingency discriminability, such as reducing the physical disparity between stimuli or inserting a delay between responses and reinforcers, decrease d sb and d br , respectively (Davison & Nevin, 1999; see also e.g., Davison & Jenkins, 1985;Everly, 2016;Godfrey & Davison, 1998). This model is easily extended to the reinforcement-for-errors procedure, in which B 21 and B 12 responses are reinforced, and such reinforcers (R 21 and R 12 ) generalize via the same mechanisms.…”