So it is possible to reduce the number of crimes. Scientists from Pennsylvania state University and Nanyang technological University in Singapore have come to the conclusion: transcranial stimulation of the prefrontal cortex is able to reduce the propensity to commit crimes of violence.
The researchers stimulated the prefrontal cortex of volunteers, including its dorsolateral area. Basically, this region is associated with the Executive functions of the brain, allowing you to plan actions in accordance with the purpose, to change reaction to the situation depending on the context and interact with new incentives to exercise cognitive flexibility. Earlier studies have shown that people prone to antisocial behavior, this area of the brain is often not active enough.
The tests also included 81 healthy adult volunteer: 39 people have undergone brain stimulation method micropolarization (transcranial direct current stimulation), 42 participants were included in the control group received a placebo. The procedure of micropolarization took 20 minutes. On the brains of volunteers exposed to weak DC current through electrodes placed on the scalp. After the treatments, all the volunteers read two stories: in one described physical violence (hit with a glass bottle to the head), in another — sexual. Participants were asked to rate on a scale how likely they would be able to perform the actions described in the stories and indicate how it conflicts with their moral principles.
Volunteers, past micropolarization, were 47 percent less prone to physical violence and 70% — to sexual. However, the procedure did not affect the level of aggression, she changed only informed decisions. This is shown by a separate experiment with voodoo dolls: participants were shown images of figures associated with close friends, volunteers, and invited to Express negative feelings to this man, “sticking” in the figure of the virtual needle (one to 51). The number of needles was approximately the same for both groups.
According to the researchers, to further explore the influence of micropolarization on the propensity to violence will help further research. The researchers plan to conduct experiments with longer procedures and point impact on small areas of the brain.