Aim 2: To identify neural pathways regulating negative moods during social rejection, using tDCS for activation and fMRI for assessment. Using a cross-over, sham-controlled design similar to previous tDCS+fMRI studies, we will measure the effects of anodal tDCS over the right or left VLPFC on neural activity and negative mood during rejection and neutral conditions. Alternate regions in separate subjects may also be stimulated including the dorsolateral prefrontal cortex, insula, anterior cingulate cortex, pre-supplementary, and supplementary motor area [all regions may be right or left hemisphere]. All of these regions have been shown to be involved in emotion regulation.