Neuroimaging results: brain regions activated in delay discounting task. (A) Neutral minus negative emotional condition. (B) Neutral minus positive emotional condition. (C, D, E) Shown are the mean activations of the orbitofrontal gyrus (OFG), inferior parietal gyrus (IPG), and dorsalateral prefrontal cortex (DLPFC) expressed as percent signal change. In these regions, activation was greatest in the neutral condition. Neu neutral, Neg negative, Pos positive.