No Comment — September 22, 2009, 3:08 pm

Torture Doesn’t Work, Neurobiologist Says

Advocates often portray torture, like waterboarding, as black magic that quickly enables the interrogator to break through his subject’s defenses and force him to divulge the location of the bomb that will destroy Los Angeles. But what does the scientific literature say? A 2006 Intelligence Science Board flatly noted that there was no data supporting the claim that torture produces reliable results. The 372-page report would be summed up by this passage: “The scientific community has never established that coercive interrogation methods are an effective means of obtaining reliable intelligence information. In essence, there seems to be an unsubstantiated assumption that ‘compliance’ carries the same connotation as ‘meaningful cooperation.’ ” In other words, waterboard someone or smack his head against the wall, and sure enough, he’ll open up and talk. But does that mean you’ll get reliable info that you couldn’t have gotten using more conventional techniques? Absolutely not. Dick Cheney insisted that two CIA analytical reports (that he apparently pressed to have prepared) concluded that his torture techniques rendered positive results. But these reports were declassified and published, and lo, they don’t say what he claimed they do.

Now another important contribution to the scientific literature has appeared. Irish neurobiologist Shane O’Mara of Trinity College Dublin, writing in Trends in Cognitive Sciences, takes a special look at the Bush Administration’s enhanced interrogation techniques:

the use of such techniques appears motivated by a folk psychology that is demonstrably incorrect. Solid scientific evidence on how repeated and extreme stress and pain affect memory and executive functions (such as planning or forming intentions) suggests these techniques are unlikely to do anything other than the opposite of that intended by coercive or ‘enhanced’ interrogation.

Newsweek’s Sharon Begley summarizes O’Mara’s analysis:

So let’s break this down anatomically. Fact One: To recall information stored in the brain, you must activate a number of areas, especially the prefrontal cortex (site of intentionality) and hippocampus (the door to long-term memory storage). Fact Two: Stress such as that caused by torture releases the hormone cortisol, which can impair cognitive function, including that of the prefrontal cortex and hippocampus. Studies in which soldiers were subjected to stress in the form of food and sleep deprivation have found that it impaired their ability to recall personal memories and information, as this 2006 study reported. “Studies of extreme stress with Special Forces Soldiers have found that recall of previously-learned information was impaired after stress occurred,” notes O’Mara. “Water-boarding in particular is an extreme stressor and has the potential to elicit widespread stress-induced changes in the brain.”

Stress also releases catecholamines such as noradrenaline, which can enlarge the amygdale (structures involved in the processing of fear), also impairing memory and the ability to distinguish a true memory from a false or implanted one. Brain imaging of torture victims, as in this study, suggest why: torture triggers abnormal patterns of activation in the frontal and temporal lobes, impairing memory. Rather than a question triggering a (relatively) simple pattern of brain activation that leads to the stored memory of information that can answer the question, the question stimulates memories almost chaotically, without regard to their truthfulness. These neurochemical effects set the stage for two serious pitfalls of interrogation under torture, argues O’Mara. The first is that “information presented by the captor to elicit responses during interrogation may inadvertently become part of the suspect’s memory, especially since suspects are under extreme stress and are required to tell and retell the same events which may have happened over a period of years.” As a result, information produced by the suspect may parrot or embellish suggestions from the interrogators rather than revealing something both truthful and unknown to the interrogators. Second, cortisol-induced damage to the prefrontal cortex can cause confabulation, or false memories. Because a person being tortured loses the ability to distinguish between true and false memories, as a 2008 study showed, further pain and stress does not cause him to tell the truth, but to retreat further into a fog where he cannot tell true from false.

There is another factor that casts doubt on the reliability of statements made by a torture subject. O’Mara puts it simply: “while I’m talking, I’m not being water-boarded.” It’s a sort of Pavlovian conditioning—if I talk, the torture will stop. Such circumstances virtually guarantee that a subject will talk. They just don’t make it more likely that he will tell the truth. In fact, just the opposite. “To briefly summarize a vast, complex literature: prolonged and extreme stress inhibits the biological processes believed to support memory in the brain,” writes the Irish scholar. “Coercive interrogations involving extreme stress are unlikely, given our current cognitive neurobiological knowledge, to facilitate the release of veridical information from long-term memory.” Let’s translate that: torture tends to make the information provided less reliable.

Share
Single Page

More from Scott Horton:

Context, No Comment August 28, 2015, 12:16 pm

Beltway Secrecy

In five easy lessons

From the April 2015 issue

Company Men

Torture, treachery, and the CIA

Six Questions October 18, 2014, 8:00 pm

The APA Grapples with Its Torture Demons: Six Questions for Nathaniel Raymond

Nathaniel Raymond on CIA interrogation techniques.

Get access to 165 years of
Harper’s for only $45.99

United States Canada

CATEGORIES

THE CURRENT ISSUE

September 2015

Weed Whackers

= Subscribers only.
Sign in here.
Subscribe here.

Tremendous Machine

= Subscribers only.
Sign in here.
Subscribe here.

A Goose in a Dress

= Subscribers only.
Sign in here.
Subscribe here.

The Genealogy of Orals

= Subscribers only.
Sign in here.
Subscribe here.

view Table Content

FEATURED ON HARPERS.ORG

Article
Romancing Kano·

= Subscribers only.
Sign in here.
Subscribe here.

I recently spent a semester teaching writing at an elite liberal-arts college. At strategic points around the campus, in shades of yellow and green, banners displayed the following pair of texts. The first was attributed to the college’s founder, which dates it to the 1920s. The second was extracted from the latest version of the institution’s mission statement:

The paramount obligation of a college is to develop in its students the ability to think clearly and independently, and the ability to live confidently, courageously, and hopefully.

leadership
service
integrity
creativity

Let us take a moment to compare these texts. The first thing to observe about the older one is that it is a sentence. It expresses an idea by placing concepts in relation to one another within the kind of structure that we call a syntax. It is, moreover, highly wrought: a parallel structure underscored by repetition, five adverbs balanced two against three.

Article
The Prisoner of Sex·

= Subscribers only.
Sign in here.
Subscribe here.

“It is disappointing that parts of Purity read as though Franzen urgently wanted to telegraph a message to anyone who would defend his fiction from charges of chauvinism: ‘No, you’ve got me wrong. I really am sexist.’”
Illustration by Shonagh Rae
Article
Gangs of Karachi·

= Subscribers only.
Sign in here.
Subscribe here.

“In Karachi, sometimes only the thinnest of polite fictions separates the politicians from the men who kill and extort on their behalf.”
Photograph © Asim Rafiqui/NOOR Images
Article
Weed Whackers·

= Subscribers only.
Sign in here.
Subscribe here.

“Defining 'native' and 'invasive' in an ever-shifting natural world poses some problems. The camel, after all, is native to North America, though it went extinct here 8,000 years ago, while the sacrosanct redwood tree is invasive, having snuck in at some point in the past 65 million years.”
Photograph by Chad Ress
Article
The Neoliberal Arts·

= Subscribers only.
Sign in here.
Subscribe here.

“College is seldom about thinking or learning anymore. Everyone is running around trying to figure out what it is about. So far, they have come up with buzzwords, mainly those three.”
Artwork by Julie Cockburn

Percentage of Britons who cannot name the city that provides the setting for the musical Chicago:

65

An Australian entrepreneur was selling oysters raised in tanks laced with Viagra.

A naked man believed to be under the influence of LSD rammed his pickup truck into two police cars.

Subscribe to the Weekly Review newsletter. Don’t worry, we won’t sell your email address!

HARPER’S FINEST

Subways Are for Sleeping

By

“Shelby is waiting for something. He himself does not know what it is. When it comes he will either go back into the world from which he came, or sink out of sight in the morass of alcoholism or despair that has engulfed other vagrants.”

Subscribe Today