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Cumulative sucrose-lever presses in the last session of Phase 2 (Extinction + Alternative Reinforcement) and all sessions of Phase 3 (Resurgence Test) for individual rats. The bottom-right panel shows group mean data for the last session of Phase 2 and the first session of Phase 3. Filled and empty squares represent total inactive lever presses for corresponding sessions in Phases 2 and 3, respectively.
