While both groups were initially similar, the 50%-1-2-3 rats came to press a distal lever more than the 100%-1 rats after only two training days. Accordingly, the 50%-1-2-3 rats looked, approached, and contacted the distal lever more than the 100%-1 rats. However, magazine-directed behaviors (goal-tracking) gradually increased in both groups over the five training sessions, but the increase was significantly higher in the 100%-1 rats than in the 50%-1-2-3 rats. Legends: * p < 0.05, *** p < 0.001.