“…On days of infusion (Fig. 2B), 600 nl of 0.9% sodium chloride (Hospira, St. Jude Pharmacy), α2-antagonist idazoxan hydrochloride (5 mg/ml, adapted from 68 , Sigma, I6138), or α2-agonist clonidine hydrochloride (5 mM, adapted from 40 , Sigma, C7897) were infused bilaterally (200 nl/min, 2 min wait) using a dual-syringe (5 μl, Hamilton, 87931) microinjection pump (KD Scientific, 14-831-211) and plastic tubing (P1 Technologies, 8F023X041P01) immediately before the maze task. Testing prior to experiments determined drug dosages that did not cause gross impairments in behavior.…”