Two automatic motivations, two control systems: A neuroscience framework for negotiation.

Negotiation often involves a recurring tension between self-interest and social preferences such as fairness, trust, honesty, and reciprocity. A central debate concerns which motive, self-interest or social preferences, constitutes the automatic default and which requires cognitive control to be expressed. Understanding these automatic processes is important because negotiations often tax cognitive resources, increasing reliance on automatic responses. Yet, the evidence remains contradictory: in some contexts, self-interest appears spontaneous and social concern effortful, whereas in others the reverse holds. This review argues that the inconsistency stems from a flawed premise. Drawing on converging evidence from social, affective, and decision neuroscience, I propose that both self-interest and social preferences are automatic motivational processes, driven by distinct motivational systems and regulated by separate prefrontal control mechanisms. The right dorsolateral prefrontal cortex (rDLPFC) is proposed to regulate reward-seeking motivation, facilitating prosocial behavior such as fairness and reciprocity, whereas the right ventrolateral prefrontal cortex (rVLPFC) is proposed to regulate socio-emotional responses, facilitating self-interested choice, together forming a proposed double dissociation within this motivational conflict. This dual-control framework reframes the central question from which motive is automatic to which automatic motivational system dominates a given context. It reconciles conflicting findings and explains why subtle situational shifts can reverse the apparent automatic response. The review considers emerging hormonal, neuromodulation, and hyperscanning evidence from dynamic interactions and discusses how changing circumstances may alter not only which motivation dominates, but also which form of control is needed to act in accordance with one's goals.