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. 2023 Dec 21;18(12):e0296090. doi: 10.1371/journal.pone.0296090

Fig 2. Changes in BP durations are due to psychological factors.

Fig 2

(A) Frustration indices (mean ± SEM) for control and incentive downshift groups under the FN12 schedule during the downshift session. Frustration index is average BP duration during test session divided by average of the previous two sessions. (B) Frustration indices of rats switched from FN12 to the FR12 schedule (FN/FR) compared to rats that remained on FN schedule (FN/FN). (C) Average BP durations during cued EXT phase and the FR5 phase immediately afterwards in male (left) and female (right) rats self-administering sucrose pellets. (D) Average BP durations during cued EXT phase and the FR5 phase immediately afterwards in male (left) and female (right) rats self-administering fentanyl. Bars are mean ± SEM. Individual male data represented by circles; individual female data represented by triangles. *P < 0.05, ***P < 0.001.