We study the neural basis of human social behavior, with a focus on morality, altruism, and socio-emotional decision-making. The human social experience centers on resolving competing pressures of harm, fairness, self-interest, and concern for others. We aim to understand how the brain detects, values, and assesses these conflicting reward and punishment contingencies, and to examine the role of emotion and its operational power in shaping these social interactions. We combine behavioral economics and social psychology tools with imaging and psychophysiological techniques to investigate the brain mechanisms that support these complex processes.