Fig. 2
From: Learning behavior in rat offspring after in utero and lactational exposure to either TCDD or PCB126
Response rate (number of lever presses per minute) of male (left) and female (right) rat offspring born to dams exposed to either TCDD or PCB126 at three different doses in phases 1, 2 and 3 in the differential reinforcement of low rates (DRL) component. Open circle indicates control, empty, gray and black squares indicate 50, 200 and 800 ng/kg of TCDD, respectively, and open, gray and black triangles indicate 500, 2,000 and 8,000 ng/kg of PCB126, respectively. Each symbol indicates the mean and SEM of a number of lever presses in each ten-session phase. *p < 0.05 (vs. other groups)