All imaging was performed on a 1.5T Signa GE LX Horizon scanner (Waukesha, WI). A heavily T1-weighted, spoiled gradient echo recalled sequence (SPGR; 124 slices; voxel size, 0.9375 mm × 0.9375 mm × 1.2 mm; field of view [FOV] = 24 cm × 24 cm; repetition time [TR] = 35 ms; echo time [TE] = 8 ms; flip angle, 30°) was first acquired for anatomic registration of the functional images. Six functional image time series (126 image volumes per series) of the blood oxygen level-dependent (BOLD) response to the odorants were then acquired using a dual echo spiral pulse sequence (Li et al., 2006; Preston et al., 2004) acquisition (22 contiguous slices acquired sequentially beginning with the most inferior; voxel size, 3.75 mm × 3.75 mm × 4.00 mm; FOV = 24 cm × 24 cm; TR = 2000 ms; TE1 = 35 ms, TE2 = 70 ms; flip angle, 90°).This sequence has considerably reduced susceptibility dropout in lateral and medial prefrontal, amygdala, and medial temporal regions. The first four image volumes were discarded from analyses to account for presaturation
