ELECTROMAGNETIC ENERGY ALTERING MORAL JUDGMENT

Moral judgments can be altered ... by magnets

By disrupting brain activity in a particular region, neuroscientists can sway people’s views of moral situations.

By Anne Trafton, MIT News Office - Graphic: Christine Daniloff  -  Originally Posted - March 30, 2010

To make moral judgments about other people, we often need to infer their intentions — an ability known as “theory of mind.” For example, if one hunter shoots another while on a hunting trip, we need to know what the shooter was thinking: Was he secretly jealous, or did he mistake his fellow hunter for an animal?

MIT neuroscientists have now shown they can influence those judgments by interfering with activity in a specific brain region — a finding that helps reveal how the brain constructs morality.

Previous studies have shown that a brain region known as the right temporo-parietal junction (TPJ) is highly active when we think about other people’s intentions, thoughts and beliefs. In the new study, the researchers disrupted activity in the right TPJ by inducing a current in the brain using a magnetic field applied to the scalp. They found that the subjects’ ability to make moral judgments that require an understanding of other people’s intentions — for example, a failed murder attempt — was impaired.

The researchers, led by Rebecca Saxe, MIT assistant professor of brain and cognitive sciences, report their findings in the Proceedings of the National Academy of Sciences the week of March 29. Funding for the research came from The National Center for Research Resources, the MIND Institute, the Athinoula A. Martinos Center for Biomedical Imaging, the Simons Foundation and the David and Lucille Packard Foundation.

The study offers “striking evidence” that the right TPJ, located at the brain’s surface above and behind the right ear, is critical for making moral judgments, says Liane Young, lead author of the paper. It’s also startling, since under normal circumstances people are very confident and consistent in these kinds of moral judgments, says Young, a postdoctoral associate in MIT’s Department of Brain and Cognitive Sciences.

“You think of morality as being a really high-level behavior,” she says. “To be able to apply (a magnetic field) to a specific brain region and change people’s moral judgments is really astonishing.”

Thinking of others

Saxe first identified the right TPJ’s role in theory of mind a decade ago — a discovery that was the subject of her MIT PhD thesis in 2003. Since then, she has used functional magnetic resonance imaging (fMRI) to show that the right TPJ is active when people are asked to make judgments that require thinking about other people’s intentions.

In the new study, the researchers wanted to go beyond fMRI experiments to observe what would happen if they could actually disrupt activity in the right TPJ. Their success marks a major step forward for the field of moral neuroscience, says Walter Sinnott-Armstrong, professor of philosophy at Duke University.

“Recent fMRI studies of moral judgment find fascinating correlations, but Young et al usher in a new era by moving beyond correlation to causation,” says Sinnott-Armstrong, who was not involved in this research.

The researchers used a noninvasive technique known as transcranial magnetic stimulation (TMS) to selectively interfere with brain activity in the right TPJ. A magnetic field applied to a small area of the skull creates weak electric currents that impede nearby brain cells’ ability to fire normally, but the effect is only temporary.
In one experiment, volunteers were exposed to TMS for 25 minutes before taking a test in which they read a series of scenarios and made moral judgments of characters’ actions on a scale of one (absolutely forbidden) to seven (absolutely permissible).

In a second experiment, TMS was applied in 500-milisecond bursts at the moment when the subject was asked to make a moral judgment. For example, subjects were asked to judge how permissible it is for a man to let his girlfriend walk across a bridge he knows to be unsafe, even if she ends up making it across safely. In such cases, a judgment based solely on the outcome would hold the perpetrator morally blameless, even though it appears he intended to do harm.

In both experiments, the researchers found that when the right TPJ was disrupted, subjects were more likely to judge failed attempts to harm as morally permissible. Therefore, the researchers believe that TMS interfered with subjects’ ability to interpret others’ intentions, forcing them to rely more on outcome information to make their judgments.

“It doesn’t completely reverse people’s moral judgments, it just biases them,” says Saxe.

When subjects received TMS to a brain region near the right TPJ, their judgments were nearly identical to those of people who received no TMS at all.

While understanding other people’s intentions is critical to judging them, it is just one piece of the puzzle. We also take into account the person’s desires, previous record and any external constraints, guided by our own concepts of loyalty, fairness and integrity, says Saxe.

“Our moral judgments are not the result of a single process, even though they feel like one uniform thing,” she says. “It’s actually a hodgepodge of competing and conflicting judgments, all of which get jumbled into what we call moral judgment.”

Saxe’s lab is now studying the role of theory of mind in judging situations where the attempted harm was not a physical threat. The researchers are also doing a study on the role of the right TPJ in judgments of people who are morally lucky or unlucky. For example, a drunk driver who hits and kills a pedestrian is unlucky, compared to an equally drunk driver who makes it home safely, but the unlucky homicidal driver tends to be judged more morally blameworthy.

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Manipulating morals: scientists target drugs that improve behavior

Researchers say morality treatments could be used instead of prison and might even help humanity tackle global issues  -  Progress, Big Brother or just creepy…?

Existing drugs such as Prozac are already known to affect moral behaviour, but scientists predict that advances may allow more sophisticated manipulations. Photograph: Scott Camazine/Alamy

A pill to enhance moral behaviour, a treatment for racist thoughts, a therapy to increase your empathy for people in other countries - these may sound like the stuff of science fiction but with medicine getting closer to altering our moral state, society should be preparing for the consequences, according to a book that reviews scientific developments in the field.

Drugs such as Prozac that alter a patient's mental state already have an impact on moral behaviour, but scientists predict that future medical advances may allow much more sophisticated manipulations.

The field is in its infancy, but "it's very far from being science fiction", said Dr Guy Kahane, deputy director of the Oxford Centre for Neuroethics and a Wellcome Trust biomedical ethics award winner.

"Science has ignored the question of moral improvement so far, but it is now becoming a big debate," he said. "There is already a growing body of research you can describe in these terms. Studies show that certain drugs affect the ways people respond to moral dilemmas by increasing their sense of empathy, group affiliation and by reducing aggression."

Researchers have become very interested in developing biomedical technologies capable of intervening in the biological processes that affect moral behaviour and moral thinking, according to Dr Tom Douglas, a Wellcome Trust research fellow at Oxford University's Uehiro Centre. "It is a very hot area of scientific study right now."

He is co-author of Enhancing Human Capacities, published on Monday, which includes a chapter on moral enhancement.

Drugs that affect our moral thinking and behaviour already exist, but we tend not to think of them in that way. [Prozac] lowers aggression and bitterness against environment and so could be said to make people more agreeable. Or Oxytocin, the so-called love hormone ... increases feelings of social bonding and empathy while reducing anxiety," he said.

"Scientists will develop more of these drugs and create new ways of taking drugs we already know about. We can already, for example, take prescribed doses of Oxytocin as a nasal spray," he said.

But would pharmacologically-induced altruism, for example, amount to genuine moral behaviour? Guy Kahane, deputy director of the Oxford Centre for Neuroethics and a Wellcome Trust biomedical ethics award winner, said: "We can change people's emotional responses but quite whether that improves their moral behaviour is not something science can answer."

He also admitted that it was unlikely people would "rush to take a pill that would make them morally better.

"Becoming more trusting, nicer, less aggressive and less violent can make you more vulnerable to exploitation," he said. "On the other hand, it could improve your relationships or help your career."

Kahane does not advocate putting morality drugs in the water supply, but he suggests that if administered widely they might help humanity to tackle global issues.

"Relating to the plight of people on other side of the world or of future generations is not in our nature," he said. "This new body of drugs could make possible feelings of global affiliation and of abstract empathy for future generations."

Ruud ter Meulen, chair in ethics in medicine and director of the centre for ethics in medicine at the University of Bristol, warned that while some drugs can improve moral behaviour, other drugs - and sometimes the same ones - can have the opposite effect.

"While Oxytocin makes you more likely to trust and co-operate with others in your social group, it reduces empathy for those outside the group," Meulen said.

The use of deep brain stimulation, used to help those with Parkinson's disease, has had unintended consequences, leading to cases where patients begin stealing from shops and even becoming sexually aggressive, he added.

"Basic moral behaviour is to be helpful to others, feel responsible to others, have a sense of solidarity and sense of justice," he said. "I'm not sure that drugs can ever achieve this. But there's no question that they can make us more likeable, more social, less aggressive, more open attitude to other people," he said.

Meulen also suggested that moral-enhancement drugs might be used in the criminal justice system. "These drugs will be more effective in prevention and cure than prison," he said.

By Amelia Hill - guardian.co.uk, Monday 4 April 2011 16.23 BST

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