FIGURE 3.

ABA renewal of responding in an operant conditioning setting. Rats learned to press an “active” lever for an intravenous mix of heroin and cocaine. Extinction: A: responding on the active lever was then extinguished over daily extinction sessions. Inset: responding in groups that received extinction in the same context or a different context from the one in which they had lever pressed for drug. B: responding on the inactive lever. Test: active and inactive lever responding in a Control group tested in the extinction context; a Novel group that was tested in a new context; and a Renewal group that was tested in the original acquisition context after extinction in a different context. Note that responding in this group was at a level comparable to level at the start of extinction. [From Crombag and Shaham (59).]