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. 2019 Jan 30;13:3. doi: 10.3389/fnbeh.2019.00003

Figure 2.

Figure 2

(A) Acquisition pattern (60 days) of ethanol 10% (0.1 ml/reward) self-administration in msP (n = 32) and Wistar (n = 31) rats under a FR-1 (day 1–8) and fixed ratio-3 (FR-3; day 9–60). (B) Number of active and inactive lever presses in both strains under a FR-1 (day 1–8) and FR-3 (day 9–60). Values are presented as mean (±SEM). ***p < 0.001 significant as compared to msP and Wistar rats in the number of reinforcers (day 3–23 and 24–60), **p < 0.01 (day 24), *p < 0.05 (day 2). ###p < 0.001, significant as compared to msP and Wistar rats in active lever presses. °°°p < 0.001 (active lever vs. inactive lever).