Brain stimulation decreases intent to commit physical, sexual assault

[Judi Lynn]

Date:
July 2, 2018
Source:
University of Pennsylvania

Stimulating the prefrontal cortex, the part of the brain responsible for controlling complex ideas and behaviors, can reduce a person's intention to commit a violent act by more than 50 percent, according to research from the University of Pennsylvania and Nanyang Technological University published in the Journal of Neuroscience. What's more, using such a minimally invasive technique, called transcranial direct-current stimulation, increased the perception that acts of physical and sexual assault were morally wrong.

"The ability to manipulate such complex and fundamental aspects of cognition and behavior from outside the body has tremendous social, ethical, and possibly someday legal implications," says Roy Hamilton, an associate professor of Neurology at Penn's Perelman School of Medicine and the senior paper author.

It's viewing violent crime from a public-health perspective, adds psychologist Adrian Raine, a Penn Integrates Knowledge Professor and co-author on the paper. "Historically we haven't taken this kind of approach to interventions around violence," he says. "But this has promise. We only did one 20-minute session, and we saw an effect. What if we had more sessions? What if we did it three times a week for a month?"

To draw these conclusions, the research team conducted a double-blind randomized control trial on 81 healthy adults ages 18 or older. At the start of the study, participants were randomly assigned to one of two groups. The first received stimulation on the prefrontal cortex for 20 minutes; the second, the placebo group, received a low current for 30 seconds, then nothing more. Participants did not know their group assignment nor did the individual conducting each experiment.

More:
https://www.sciencedaily.com/releases/2018/07/180702133909.htm