Fig. 5
From: Sex differences in sucrose reinforcement in Long-Evans rats
Sucrose PR training and testing females vs. males. Females responded for sucrose more than males during training and testing. For training (top), responding by males and females increased over days of training. For testing (bottom), the only concentration-dependent effect was a decrease in responding at the 30 vs. 7.5% concentration only, for both females and males (#vs. 7.5%, p < 0.05)