Fiber optics were implanted into the dorsal bed nucleus of the stria terminalis (dBNST) of 8-week-old male and female Sprague Dawley rats. Dopamine activity was measured using GRABda signals in the dBNST during a series of behavioral experiments. Experiments includes a Pavlovian lever autoshaping (PLA) training, a reward prediction error (RPE) probe session, and a satiety test. Rats were injected with fentanyl prior to the PLA session.