Figure 1.

Lever press and food cup entry number, probability and latency were combined into a PCA index score for each session and averaged over the 12 PCA sessions. PCA index scores are used to classify rats as sign-trackers (STs) (score +0.3 to +1.0), intermediates (Int.) (score −0.29 to +0.29) and goal-trackers (GTs) (score −1.0 to −0.3). (A) Male groups exposed to vaporized nicotine in adolescence had a higher PCA index score compared to CO males. (B) No significant differences for PCA index scores were detected in females. The data are presented as mean ± SEM. *p ≤ .05 significant difference between males that received vaporized nicotine and males that did not receive vaporized nicotine in adolescence.