Neuroscience
You wouldn't know it from the claims of companies like No Lie MRI, but we're a long way off being able to use brain scans to detect reliably whether a person is lying or not. Nonetheless, cognitive psychologists are busy beavering away in the background, testing the ways that brain activity varies when people lie compared with when they tell the truth. One such study has just been published, claiming to be the first to investigate deception in the context of face recognition.
Sujeeta Bhatt and colleagues scanned the brains of 18 participants undergoing a simple task designed to simulate a police line-up. The researchers compared brain activity across three conditions: when the participants pointed out truthfully which face from three they'd seen earlier; when they lied and pointed to a new face rather than the one they'd seen earlier; and finally a condition where all the faces were new but the participants lied and pretended to have seen one of them before.
No single brain area was active when the participants lied compared with when they told the truth. However, a network of frontal and parietal regions were more active in the lying conditions. This network included the dorso- and ventro- lateral prefrontal cortices, the superior frontal gyri, and the anterior cingulate gyrus, all of which are found at the front of the brain. These areas are known to be involved in working memory, response selection and error monitoring. In the parietal lobe, the precuneus - an area known to be involved in visual imagery- also showed increased activity during lying.
"It is possible that the frontal and parietal area activation seen in the current study is a result of the complex interplay of working memory, response inhibition, sustained attention, and mental calculations necessary for our subjects to make a deceptive response," Sujeeta Bhatt and her colleagues said.
However, they further acknowledged that like other studies in this field, their findings are limited by the fact that their participants were not under anything like the kind of pressure that is normally associated with lying in real life. Also, don't forget studies like this one are looking at average group differences in lying versus truth-telling conditions, rather than studying an individual, as would presumably be required most often in real-life settings. That said, this study makes a worthy contribution to an emerging field that piece by piece will surely one day soon lead to a brain-based lie detection system - watch this space!
_________________________________
Bhatt, S., Mbwana, J., Adeyemo, A., Sawyer, A., Hailu, A., & VanMeter, J. (2009). Lying about facial recognition: An fMRI study Brain and Cognition, 69 (2), 382-390 DOI: 10.1016/j.bandc.2008.08.033
Post written by Christian Jarrett (@psych_writer) for the BPS Research Digest.
- How To Cheat A Brain-scan-based Lie Detector
Cheating the scanner is relatively easySure, it's possible to differentiate patterns of truth-telling brain activity from patterns of lying-related activity. But contrary to media hype, experts have been quick to point out that the accuracy of brain-scan...
- I'm Not Lying: Brain Stimulation Boosts People's Deception Skills
There's been so much excitement and hyperbole surrounding the promise of brain imaging as a lie detection technique, but what about the needs of the cads, thieves and vagabonds of this world? Has contemporary cognitive neuroscience nothing to offer...
- Would I Lie To You Yet Again?
The Deception Blog alerts our attention to yet another breathless and swooning report on reading the fMRI tea leaves of lie detection in their post, More fMRI stuff and nonsense. The ABC report says virtually nothing specific about what purportedly happens...
- Brain Scans And Lie Detection: True Or False?
Now this is a rapidly expanding area of research (and one that's quite well-funded by the DOD). Wired did a piece on this recently (Don't Even Think About Lying), and there's an AP story that appeared in papers around the country (e.g., the...
- Truth-telling And The Brain
Can brain-imaging technologies show whether we are being truthful or not? A current study, reported by Reuters (as found on the Houston Chronicle website), takes a look:Brain scans can tell who's lying, who's not Reuters News Service Nov. 29,...
Neuroscience
BOLD-faced lie detection
You wouldn't know it from the claims of companies like No Lie MRI, but we're a long way off being able to use brain scans to detect reliably whether a person is lying or not. Nonetheless, cognitive psychologists are busy beavering away in the background, testing the ways that brain activity varies when people lie compared with when they tell the truth. One such study has just been published, claiming to be the first to investigate deception in the context of face recognition.Sujeeta Bhatt and colleagues scanned the brains of 18 participants undergoing a simple task designed to simulate a police line-up. The researchers compared brain activity across three conditions: when the participants pointed out truthfully which face from three they'd seen earlier; when they lied and pointed to a new face rather than the one they'd seen earlier; and finally a condition where all the faces were new but the participants lied and pretended to have seen one of them before.
No single brain area was active when the participants lied compared with when they told the truth. However, a network of frontal and parietal regions were more active in the lying conditions. This network included the dorso- and ventro- lateral prefrontal cortices, the superior frontal gyri, and the anterior cingulate gyrus, all of which are found at the front of the brain. These areas are known to be involved in working memory, response selection and error monitoring. In the parietal lobe, the precuneus - an area known to be involved in visual imagery- also showed increased activity during lying.
"It is possible that the frontal and parietal area activation seen in the current study is a result of the complex interplay of working memory, response inhibition, sustained attention, and mental calculations necessary for our subjects to make a deceptive response," Sujeeta Bhatt and her colleagues said.
However, they further acknowledged that like other studies in this field, their findings are limited by the fact that their participants were not under anything like the kind of pressure that is normally associated with lying in real life. Also, don't forget studies like this one are looking at average group differences in lying versus truth-telling conditions, rather than studying an individual, as would presumably be required most often in real-life settings. That said, this study makes a worthy contribution to an emerging field that piece by piece will surely one day soon lead to a brain-based lie detection system - watch this space!
_________________________________
Bhatt, S., Mbwana, J., Adeyemo, A., Sawyer, A., Hailu, A., & VanMeter, J. (2009). Lying about facial recognition: An fMRI study Brain and Cognition, 69 (2), 382-390 DOI: 10.1016/j.bandc.2008.08.033Post written by Christian Jarrett (@psych_writer) for the BPS Research Digest.
There are plenty of popular science articles about the potential of brain-based lie detection. Here's a sample:
Don't even think about lying.
Duped - Can brain scans uncover lies?
Watching the brain lie.
- How To Cheat A Brain-scan-based Lie Detector
Cheating the scanner is relatively easySure, it's possible to differentiate patterns of truth-telling brain activity from patterns of lying-related activity. But contrary to media hype, experts have been quick to point out that the accuracy of brain-scan...
- I'm Not Lying: Brain Stimulation Boosts People's Deception Skills
There's been so much excitement and hyperbole surrounding the promise of brain imaging as a lie detection technique, but what about the needs of the cads, thieves and vagabonds of this world? Has contemporary cognitive neuroscience nothing to offer...
- Would I Lie To You Yet Again?
The Deception Blog alerts our attention to yet another breathless and swooning report on reading the fMRI tea leaves of lie detection in their post, More fMRI stuff and nonsense. The ABC report says virtually nothing specific about what purportedly happens...
- Brain Scans And Lie Detection: True Or False?
Now this is a rapidly expanding area of research (and one that's quite well-funded by the DOD). Wired did a piece on this recently (Don't Even Think About Lying), and there's an AP story that appeared in papers around the country (e.g., the...
- Truth-telling And The Brain
Can brain-imaging technologies show whether we are being truthful or not? A current study, reported by Reuters (as found on the Houston Chronicle website), takes a look:Brain scans can tell who's lying, who's not Reuters News Service Nov. 29,...