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. 2018 Jul 10;12:134. doi: 10.3389/fnbeh.2018.00134

Figure 2.

Figure 2

Effects of CSS on days 1–15 on reward-directed behavior in Experiment 1. (A–D) Scores for the first 30 trials per session in the RST on days 16–17: (A) Number of sucrose pellets obtained. (B) Mean response latency to a tone conditioned stimulus (CS; maximum duration 30 s) associated with pellet availability. (C) Mean response latency in the inter-trial intervals (ITI, 50 ± 30 s) between successive CS. (D) Mean CS/ITI reciprocal ratio. Values are overall mean ± SD. Significant statistical effects indicated were obtained with mixed factorial analysis of variance (ANOVA); *p < 0.05, ****p < 0.0001, in post hoc tests of single sessions following Group η Trial interaction. (E–F) Scores for the EVT on day 19, using a shallow progressive ratio schedule (PRS). (E) Number of operant responses. (F) Number of sucrose pellets earned. (G) Final ratio attained. Graphs are scatter plots and mean values per group. Significant statistical effects indicated were obtained with unpaired t-tests; *p < 0.05, **p < 0.01.