Figure 3From: Postnatal exposure to PCB 153 and PCB 180, but not to PCB 52, produces changes in activity level and stimulus control in outbred male Wistar Kyoto ratsThe total number of lever-presses with short IRTs (< 0.67 s) in the four groups. The vertical dotted line indicates when the contingencies changed from VI 3 s (sessions 8-12) to VI 180 s (sessions 13-33).Back to article page