Fig. 5.

Freezing in low and high playing rats during the 2 min before (no tone) and during 2-min presentation of the footshock-associated CS + (tone) period in the conditioning chamber. The conditioned low and high playing rats (CS +) showed significant context- and CS-induced freezing, when compared to their respective CS − control groups. Group sizes for low playing rats: LP CS − N = 9, LP CS + N = 7, for high playing rats: HP CS − N = 13, HP CS + N = 16. The fear conditioning test was performed 1 week after completion of the conditioned suppression test. Data are presented as mean + SEM. ***Significant difference between CS + and CS − groups (post hoc pairwise comparisons, p < 0.001)