Figure 2. Effects of continuous injection of thiopental on changes in output of amino acids induced by forebrain ischemia in the hippocampal CA1 region. (open circle) = Controls (halothane-anesthetized); (closed circle) = thiopental-anesthetized group; (closed triangle) = postischemic administration group. Each value represents the mean +/- SEM for four to seven animals. *P < 0.05; **P < 0.01 compared with the respective values in the control group. Closed rectangles represent the duration of ischemia produced by occlusion of bilateral carotid arteries.