All chemicals were purchased from Sigma Aldrich (St. Louis, MO). Stock solutions of dopamine HCl (10 mM) were made in 0.1 N perchloric acid and diluted to the desired concentration the day of experiment in artificial cerebrospinal fluid (aCSF) described previously [19 (link)] and comprised of (in mM): 125 NaCl, 4 KCl, 1.3 CaCl2, 1 MgCl2, 0.66 NaH2PO4, 2 Na2HPO4, 1 glucose, pH 7.4. All solutions were made in 18 mOhm water (Barnstead E-Pure, Thermo Scientific, Waltham, MA).
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