Experimental sessions were conducted in two standard operant conditioning chambers controlled by Med-PC IV software (Med Associates; St. Albans, VT) as described in detail previously (Bertz and Woods, 2013 (link)). Each chamber was contained inside a light- and sound-attenuating cubicle and was located in a separate room of the laboratory. The right wall of each chamber contained a white incandescent houselight (ENV-215M, Med Associates) and the speaker for a tone generator (ENV-224AM and ENV-230, Med Associates). Two nose-poke manipulanda containing LED stimulus lights (ENV-114BM, Med Associates) could also be inserted into the right wall. When the nose-pokes were removed from the chamber, they were replaced by blank aluminum panels.
Motorized syringe drivers (PHM-107, Med Associates) were located outside of the light- and sound-attenuating cubicles to deliver IV drug injections. Syringes were attached to Tygon tubing (S-54-HL, Norton Performance Plastics) leading to a counterweighted fluid swivel (375/22PS, Instech Laboratories) and spring tether.
Motorized syringe drivers (PHM-107, Med Associates) were located outside of the light- and sound-attenuating cubicles to deliver IV drug injections. Syringes were attached to Tygon tubing (S-54-HL, Norton Performance Plastics) leading to a counterweighted fluid swivel (375/22PS, Instech Laboratories) and spring tether.
