Shocking Therapy

Scientists Want to Shock Prisoners’ Brains to Fight Aggression

But some question the ethics of experimenting on prisoners.

3. 6. 19 by Kristin Houser
TryJimmy/Victor Tangermann
Image by TryJimmy/Victor Tangermann

Curbing Violence

Prisons are often rife with violence. But that might change if an upcoming experiment has the desired effect — and if society can stomach the ethical implications of tinkering with inmates’ brains.

Researchers from Spain’s University of Huelva told New Scientist they’ll soon launch a study to see if they can calm the violent urges of Huelva Prison’s inmates by treating them with transcranial direct current stimulation (TDCS) — in other words, by zapping the inmates’ brains with electricity.

“The study is to try to find out if TDCS has an effect on different assessments of aggression,” project lead Andrés Molero-Chamizo told New Scientist. “It could help to keep order inside a prison.”

Shocking Study

The researchers plan to enlist a minimum of 12 male volunteers serving murder sentences. For three days in a row, they’ll strap electrodes to each man’s head and turn on an electric current for 15 minutes, a process they say is painless.


At the beginning and end of the experiment, each subject will answer whether or not he agrees with a set of statements, such as “once in a while, I can’t control the urge to strike another person.”

In addition to this self-reporting, the team also hopes to collect samples of each man’s saliva to look at their cortisol levels, to investigate whether the stress hormone could provide insight into the inmate’s aggression.

Captive Audience

This isn’t the first time the University of Huelva team has tested the ability of electrical brain stimulation to curb inmates’ violent tendencies — in January, they published the results of another study featuring a group of 41 prisoners. That experiment focused on a different kind of TDCS, but it produced promising results.

However, some question the ethics of experimenting on prisoners at all.


“I would have big concerns about this,” forensic psychiatrist Delaney Smith told New Scientist. “Prison is an inherently coercive environment. Prisoners could always be thinking that this might be beneficial to their case in the future.”

Still, if TDCS is able to help prisoners curb their violent urges, it could be a promising means of keeping inmates safe while they do their time behind bars.

READ MORE: Exclusive: Brain Zap Therapy for Aggression to Be Tested on Prisoners [New Scientist]

More on TDCS: Shocking a Person’s Brain Could Make Them Less Violent, Study Shows


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