Fig. 6.

Effect of repetitive amphetamine treatment on the latency of the first post-drug FM 50-kHz call in various rat subsets identified based on their response to the TIPS protocol (negR negative responders, LR low responders, HR high responders). Two-way ANOVA—group effect: F _{2, 19} = 1.28, p = 0.30; day effect: F _{3, 57} = 11.31, p < 0.001; day × group interaction effect: F _{6, 57} = 2.14, p = 0.062. *p < 0.05, **p < 0.01 vs. the corresponding day 1 value; the Tukey test