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Study reveals brain stimulation increases altruism
Researchers at the University of Zurich have found that applying electrical currents to specific brain regions can make people more generous-at least briefly. The discovery sheds light on the neural mechanisms behind selfless behavior and could aid in treating certain brain disorders.
How the experiment worked
In the study, 44 volunteers were asked to divide money between themselves and an anonymous partner. While making these decisions, participants received mild electrical stimulation to two brain areas: the frontal lobe (linked to decision-making) and the parietal lobe (associated with empathy).
When both regions were stimulated simultaneously, participants gave away more money than they did without the intervention. The effect, though modest, was statistically significant, according to lead researcher Prof. Christian Ruff.
Neural basis of altruism
The findings build on earlier work by the same team, which identified that these two brain regions communicate more actively when people make selfless choices. The empathy-linked area and the decision-making area appeared to synchronize when participants opted to share more generously.
"This suggests altruism is hardwired into our brains," Prof. Ruff told BBC Radio 4's Inside Science. "It likely evolved to help us care for others."
Short-term effects and potential applications
The generosity boost was temporary, fading after the stimulation ended. Prof. Ruff compared it to exercise: a single session won't create lasting change, but repeated stimulation over time might. The team envisions future clinical use for people with disorders that impair social behavior, such as those who struggle to consider others' perspectives.
"What's new here is evidence of cause and effect. When we altered communication in this brain network, people's sharing decisions changed,"
Dr. Jie Hu, East China Normal University
Ethical considerations
One volunteer described the stimulation as feeling like "a warm shower or small drops of rain" on the scalp, with no sense of external influence. Prof. Ruff emphasized that the procedure is strictly regulated, requiring ethics approval and informed consent-unlike the unchecked behavioral nudges from advertising or social media.
"People can withdraw at any time," he noted. "This is far more transparent than the hidden influences we encounter daily."
Broader implications
The study, published in a peer-reviewed journal, highlights how targeted brain stimulation could one day help treat conditions marked by extreme self-centeredness. However, the researchers caution that long-term behavioral change would require sustained intervention, much like physical training.
