Twenty-four hours following the final (12th) IAP access session animals received access to an unsweetened 10% alcohol (v/v) solution for 2CAP sessions. 2CAP sessions occurred during the dark phase of the light/dark cycle, starting 1–3 h after lights off. The conditioning box configuration is illustrated in Figure 1A. During 2CAP, a white stimulus light was illuminated for 2 s on one side of the rectangular box at random. One second after this light was turned off, a sipper tube containing 10% alcohol (v/v) solution was extended into the box on the same side as the light cue. Thus, the light was a Discriminative stimulus (DS+) that predicted the location that the alcohol was to be made available. To ensure the sipper motor sound did not serve as a directional cue, both tube motors were turned on for the same duration, but only the appropriate sipper entered the chamber. The tube was available for ≈10 s. Each trial was separated by a 20- to 180-s intertrial interval (ITI; 90 s on average; randomized order). A total of 40 trials were conducted
