Outline of the imaging session. A total of six functional imaging scans of combined olfactory/visual stimulation were performed (24 2-second odor events in each of the 3 stimulus classes of AcO, AppCo, and SO were intermixed with 32 2-second IAPS image presentations), with two scans completed for each mood (2 positive image scans, 2 negative image scans, and 2 neutral image scans). Scan order was randomly assigned, with a break after the first three scans, although randomization was restricted so that all three moods were experienced prior to and again following the break.
