Fig. 6.

The overall correlation between cue-elicited intrusive behavior and cue-elicited lever pressing in sensitized and control rats. After a microinjection of intra-accumbens amphetamine, there was a significant negative correlation between intrusive behavior and lever pressing during the sucrose cue presentations (Pearson correlation) (B). After the vehicle microinjection, however, there was no significant relationship between cue-elicited intrusive behavior and cue-elicited lever pressing (A), which may be attributable to the lower amount of total intrusive behavior that was expressed under the vehicle testing condition.