Before entering the scanner, subjects were familiarized with the odorants by smelling each (grouped by the stimulus classes of AO, NApO, ApCO) through the olfactometer while simultaneously viewing representative images on a computer monitor. Just prior to combined odor/picture cue-exposure (baseline), and again after each of the three stimulus classes, subjects answered questions probing mood and craving. Subjects rated desire to drink alcohol by responding to four items (#11, #18, #21, #32) from the Alcohol Craving Questionnaire (ACQ; Singleton, Tiffany, & Henningfield, 2000) on a visual analog scale (VAS; 1= strongly disagree, 7= strongly agree). Subjects similarly rated mood (“Right now, I feel angry, grouchy, annoyed, bad-tempered”, “Right now, I feel happy, energetic, full of pep, cheerful, vigorous”).
