183 cm catheter extension sets

During sessions, monkeys were seated in chairs (Primate Products, Miami, FL) located in ventilated, sound attenuating chambers, which were equipped with response panels containing stimulus lights, two response levers, and pellet troughs. Food pellets (5TUT, Test Diet, Richmond, IN) were delivered to the troughs by pellet dispensers (Med Associates, Inc., St. Albans, VT) located outside of chambers. Self-administered drug was delivered to catheters from syringes placed in syringe drivers (model PHM-100; Med Associates, Inc., St. Albans, VT) outside of chambers. Syringes were connected to ports by 183-cm catheter extension sets (Baxter Healthcare, Deerfield, IL) and 20-g Huber-point needles (Access Technologies, Skokie, IL). The infusion rate was 2.3 ml/min (monkeys JA and KI) or 3.4 ml/min (monkeys HU and MU). A computer used MedPC IV software (Med Associates, Inc., St. Albans, VT) to control experimental events and collect data. White noise was provided in each chamber.

During experimental sessions, monkeys sat in commercially available chairs (Primate Products, Miami, FL), which were placed in ventilated and sound-attenuating chambers equipped with two response levers. Stimulus lights located above each lever could be illuminated either green or red. Syringes in syringe pumps (Med Associates, Inc.) were connected to each vascular access port with a 20-g Huber-point needle (Access Technologies) and 183-cm catheter extension sets (Baxter Healthcare, Deerfield, IL). The size of the syringe depended on the size of the monkey, and the infusion rate varied depending on the size of the syringe (2.3 ml/min for a 30-ml syringe; 3.4 ml/min for a 60-ml syringe). Experimental events were controlled and data recorded by a computer operating MedPC IV software (Med Associates, Inc., St. Albans, VT). White noise was present in chambers to mask extraneous sounds.