Brain stimulation study reveals how generosity can be triggered by science

A new study has found that stimulating specific brain regions can make people act more generously. Published in PLOS Biology, the research shows a direct link between brain activity and altruistic decisions. Scientists used a non-invasive technique to influence how participants shared money in an experiment.

The team applied transcranial alternating current stimulation (tACS) to synchronise neuronal activity in the frontal and parietal lobes. These areas are known to play a role in decision-making and social behaviour. Participants then took part in the 'Dictator Game', where they decided how much money to share with others.

When gamma oscillations in these brain regions were enhanced, people made more generous choices. The study's co-author, Jie Hu, explained that this provides clear evidence of a cause-and-effect relationship between brain network communication and sharing behaviour. Christian Ruff, another researcher, emphasised the wider importance of the findings for understanding cooperation and social decisions.

The researchers also suggested that future work should combine brain stimulation with electroencephalography (EEG). This would allow direct observation of neuronal activity during decision-making.

The findings add to growing research on non-invasive brain stimulation techniques. Over the past five years, studies have shown their potential for treating conditions like depression, chronic pain, and Parkinson's disease. They have also been explored for neurorehabilitation, addiction treatment, and cognitive enhancement. This study now demonstrates their possible role in influencing social behaviour.