Figure 3
Effect of naltrexone (NTX) on food seeking. Effects of NTX on food-seeking under a second-order schedule of reinforcement during the first food-free interval (a, b) and after food delivery (second interval) (c, d) in male (n=6, gray bars) and in female (n=6, white bars) rats. Data shown are mean (±SEM) number of presses on the active (a, c) and inactive lever (b, d). *p<0.05 compared with vehicle-treated animals.
