Desire to drink as a function of exposure to combined odors/pictures during the pre-imaging familiarization procedure was assessed with a Genotype(2) × Stimulus(4) × Condition(2) linear mixed-effects model. Condition and stimulus were repeated measures, with stimulus comprising pre-stimulus baseline, as well as the three odorant types accompanied by their representative photos. This model showed a significant main effect for Stimulus (F= 11.623,34, p< 0.001; Figure 2), with AO and related images being the only stimulus set that was significantly different than baseline (p < 0.001). The main effects for Condition and Genotype were insignificant (i.e., there were no differences in craving by genotype), as were the interaction terms.
