The lying game

October 30, 2015

UNIVERSITY of Huddersfield investigative psychology lecturer Dr Chris Street is making breakthroughs that are leading towards a clearer understanding of how humans tell lies and how their deceptions can be detected. For more than 30 years it has been said that we should trust our hunches and unconscious knowledge of body language. Yet his work, described in a new journal article, shows that we would be better off consciously relying on a single "cue", such as whether or not a person is plainly thinking hard.

But gathering reliable research data is a tricky proposition. To begin with, a set of lies and truths need to be collected. Ideally, participants should not be aware that they are taking part in experiments that are dealing with the subject of truth and lies. So Dr. Street and his colleague devised an ingenious and well-intentioned deception of their own that involved hiring a film studio in London and persuading passers-by to be interviewed for a "documentary" on tourism.

They were told by research assistants placed outside the studio that the film makers were running out of time and asked if, in addition to describing genuine travel experiences, they would talk about places they had not actually visited. Inside the studio, the speakers were then interviewed by a director who - they supposed - was unaware that they had agreed to lie on film.

"The idea was that they were lying to someone that they could potentially deceive. They were lying on behalf of another person, but the lie was spontaneous and told with an intention to mislead," said Dr. Street. The sequence of filmed interviews that resulted from the experiment constitutes a valuable body of material that is being made available to other researchers in what is still the relatively new field of human lie detection.

For more than 30 years, the standard approach to tapping the unconscious has been to use the "indirect lie detection" method.

"People are asked to rate some behaviour that is indirectly related to deception," explained Dr. Street. "For example, does the speaker appear to be thinking hard or not? The researcher then converts all thinking-hard judgments into lie judgments and all not-thinking-hard judgments into truth judgments."

The fact that these indirect judgments give better accuracy than asking people to directly and explicitly rate statements as truth or lies has been taken as evidence that people have innate, unconscious knowledge about human deception. Dr Street and his co-researcher and author Dr Daniel Richardson, of University College London, have developed a different explanation, which they explore in their new article in the Journal of Experimental Psychology: Applied.

"Indirect lie detection does not access implicit knowledge, but simply focuses the perceiver on more useful cues," write the authors. It is an argument that could have real-world significance, in the training of interrogators, for example.

"There has been a push in the literature suggesting that indirect lie detection works and the reason is that it is unconscious - so people should not be making reasoned judgments but relying on their gut feeling," said Dr. Street. "But if our account is correct, that is a very bad way to go."

He readily concedes that human lie detection - while a fascinating subject - requires a great deal more research and is a long way from infallibility.

"Typical accuracy rates are around 54%, reaching up to around 60% with training. So there is unlikely to be a one-size-fits-all strategy that gives us accuracy rates anything like what we would want in a legal setting. The field needs to start considering how to improve clues to deception, how to prevent raters from using less reliable clues, and to better understand how information about the current context plays into that judgment.

"We often think of nonverbal behaviour when we think of deception," continued Dr Street. "But it would be better to focus on the content of the tale people are selling us, and asking if it is consistent with other facts we know. But even then there is a large amount of room for error."

If human lie detection has a long way to go and there is probably a cap on the accuracy that can be achieved, could the polygraph machine fill the gap? No, asserts Dr Street, adding that the British Psychological Society is one body that has dismissed the polygraph as a tool that will never be useful.

It purports to work by detecting anxiety. "But are liars more anxious than truth tellers?" said Dr Street. "The reality is no, because often the reason we lie is that to tell the truth would be very difficult and more anxiety-provoking than a lie."
The article "The focal account: Indirect lie detection need not access unconscious, implicit knowledge", by Chris Street and Daniel Richardson, is in Journal of Experimental Psychology: Applied.

University of Huddersfield

Related Lying Articles from Brightsurf:

Lie detection -- Have the experts got it wrong?
Researchers led by the University of Portsmouth carried out a critical analysis of the Model Statement lie detection technique and the results have been published today in the Journal of Investigative Psychology and Offender Profiling.

Wuhan study shows lying face down improves breathing in severe COVID-19
In a new study of patients with severe COVID-19 (SARS-CoV-2) hospitalized on ventilators, researchers found that lying face down was better for the lungs.

Baldness gene discovery reveals origin of hairy alpine plants
Scientists have solved a puzzle that has long baffled botanists -- why some plants on high mountainsides are hairy while their low-lying cousins are bald.

People may lie to appear honest
People may lie to appear honest if events that turned out in their favor seem too good to be true, according to new research published by the American Psychological Association.

Lame sheep adjust their behavior to cope with their condition, says a new study
Using novel sensing technology, experts from the University of Nottingham have found that lame sheep adjust how they carry out certain actives, such as walking, standing or laying down, rather than simply reducing the amount they do.

Men think they're better liars
Men are twice as likely as women to consider themselves to be good at lying and at getting away with it, new research has found.

Children told lies by parents subsequently lie more as adults, face adjustment difficulty
'If you don't behave, I'll call the police,' is a lie that parents might use to get their young children to behave.

Heating pads may lower blood pressure in people with high blood pressure when lying down
In people with supine hypertension due to autonomic failure, a condition that increases blood pressure when lying down, overnight heat therapy significantly decreased systolic blood pressure compared to a placebo.

More time spent standing helps combat effects of sedentary lifestyle
A study conducted by scientists from the University of Granada and published in the journal PLOS ONE recommends that people spend more time standing, to increase energy expenditure and thus avoid the negative health problems associated with a sedentary li

New test to snare those lying about a person's identity
A new test developed by the University of Stirling could help police to determine when criminals or witnesses are lying about their knowledge of a person's identity.

Read More: Lying News and Lying Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to