 fMRI Scanning Blood oxygen level-dependent BOLD fMRI scanning will be performed on a research dedicated Siemens 3T whole body MRI scanner located in the Emory Hospital MRI Center. Foam padding will be used to restrict the subjects head motion within the magnet. 30 axial slices of 3 mm thickness will be acquired parallel to the AC-PC line with a matrix size of 64 x 64 over a field of view of 22 x 22 cm, using a TE of 30 msec. With this protocol we have successfully imaged the orbitofrontal cortex with minimal magnetic susceptibility artifacts. The functional images will be obtained using a T2 weighted spiral-scan pulse sequence TR 3000 msec, TE 25 msec, flip angle 60 deg. High resolution anatomical T1-weighted MR images will be acquired for localization of task-related neural activations TR 10 msec, TE 4.5 msec, TI900 msec, FOV24 cm, 256 x 256 matrix, contiguous 3 mm slices covering the whole brain. 