(A) In the operant drug discrimination procedure, on alcohol training sessions, alcohol sets the occasion for which responses on the left lever result in sucrose delivery; responses on right lever have no consequences. This leads to an increase in alcohol-appropriate (i.e., left) lever responses. On water training sessions, responses on the right lever result in sucrose delivery; responses on the left lever have no consequences. This lead to an increase in water-appropriate (i.e., right) lever responses. (B) In the Pavlovian drug discrimination procedure, on alcohol sessions, alcohol sets the occasion for which the offset of a light (conditioned stimulus; CS) will be followed by sucrose delivery, which leads to an increase in head entries (conditioned response; CR) during the light. On water sessions, no sucrose is delivered following light offset, which lead to a decrease in head entries during the light CS.