In all experiments mice were administered the selective COMT inhibitor tolcapone (30mg/kg; TRC Inc)(25 (link),41 (link)) and/or the selective DAT blocker GBR-12909 dihydrochloride (6mg/kg, Tocris)(42 (link)). These doses are effective at altering behavior without causing motor stereotypies (see Supplementary Information). D-amphetamine (in sulfate formulation; Tocris) was used at 4mg/kg (43 (link)), and the NET blocker atomoxetine (in hydrochloride formulation; Tocris) at 1mg/kg (44 (link)) in the voltammetry experiment only. All drugs were dissolved in 20% hydroxypropyl-beta-cyclodextrin (Acros Organics) in 0.9% saline (AquPharm), which served as a vehicle control in all experiments. All drugs were delivered by intraperitoneal injection.