October 03, 2013
Brain Stimulation Alters Social Norm Compliance Rates

Christian Ruff, Giuseppe Ugazio, and Ernst Fehr from the University of Zurich found that low level electric currents into the prefrontal cortex of the brain raised or lowered willingness to voluntarily treat others fairly.

For the study, 63 participants took part in an experiment in which they received money and were asked to decide how much of it they wanted to share with an anonymous partner. A prevalent fairness norm in Western cultures dictates that the money should be evenly split between the two players. However, this contrasts with the participants' self-interest to keep as much money as possible for themselves. In another experiment, the participants were faced with the same decision, but knew in advance that they could be punished by the partner for an unfair proposal.

By means of a technique called "transcranial direct current stimulation," which sends weak and painless electric currents through the skull, the excitability of specific brain regions can be modulated. During this experiment, the scientists used this technique to increase or decrease neural activity at the front of the brain, in the right lateral prefrontal cortex. Christian Ruff, Professor of Neuroeconomics and Decision Neuroscience at the University of Zurich, said: "We discovered that the decision to follow the fairness norm, whether voluntarily or under threat of sanctions, can be directly influenced by neural stimulation in the prefrontal cortex."

Will criminals ever be offered probation conditioned on their willingness to accept a brain implant that will alter their behavior? Will some national governments not even bother to ask and just implant circuits that can generate currents and alter behaviors?

Current flows had opposite effects on willingness to comply with sanctions or to comply when no sanctions are threatened.

When neural activity in this part of the brain was increased via stimulation, the participants' followed the fairness norm more strongly when sanctions were threatened, but their voluntary norm compliance in the absence of possible punishments decreased. Conversely, when the scientists decreased neural activity, participants followed the fairness norm more strongly on a voluntary basis, but complied less with the norm when sanctions were threatened. Moreover, neural stimulation influenced the participants' behavior, but it did not affect their perception of the fairness norm. It also did not alter their expectations about whether and how much they would be punished for violating the norm.

Wild stuff. Will a substantial fraction of the human race become puppets to brain implants, neural stem cell therapies, or gene therapies delivered involuntarily to alter behavior?

Share |      Randall Parker, 2013 October 03 09:34 PM 

Joseph Hertzlinger said at October 6, 2013 8:05 PM:

Are there any studies of transcranial direct current stimulation with a decent sample size?

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