The paper summarises an experiment to determine how DLPFC operates with respect to receiving unfair offers in the Ultimatum Game, using repetitive transcranial magnetic stimulation (rTMS). The objective was to tease out how the human instinct for ‘reciprocal fairness’ is realised in the brain. It sheds important light on a topic that crops up continuously in research into decision making and emotion regulation, namely that of executive control. The conclusion of the paper was clear: a subject’s first impulse is selfish, i.e. to accept the unfair offer. Right DLPFC activity ‘modulates’ the subject’s instinct to accept the unfair offer, which can extend as a result to rejection of the unfair offer.

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