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Mean (± SEM) number of lever presses during Session 13 after 2-amino-5 phosphonopentanoic acid (AP-5) or vehicle infusions into the central nucleus of the amygdala. Previously AP-5-treated rats (n = 8) and previously vehicle-treated rats (n = 6) were divided into two groups (n = 7 per group). One group received an AP-5 infusion before Session 13; the remaining group received a vehicle infusion. AP-5 infusions decreased the number of lever presses regardless of previous drug history.
