Researchers from the University of Hertfordshire have concluded that the concept of lying eyes is a myth.
For decades experts have been convinced that eye movements can reveal when someone is lying. Many psychologists believe that when a person looks up to their right they are likely to be telling a lie.
Glancing up to the left, on the other hand, is said to indicate honesty. But the experts are wrong, according to Professor Richard Wiseman and his team of researchers, who tested whether eyes really can reveal lies.
The claimed link between lying and eye movements is a key element of neuro-linguistic programming (NLP), a method of enhancing people's lives using psychological techniques. An important aspect of NLP involves teaching people about the relationship between eye movements and thought.
According to the theory, when right-handed people look up to their right they are likely to be visualising a "constructed" or imagined event. In contrast when they look to their left they are likely to be visualising a "remembered" memory. For this reason, when liars are constructing their own version of the truth, they tend to look to the right.
The idea was tested by filming volunteers and recording their eye movements as they told the truth or lied. A second group of volunteers was then asked to watch the films and try to detect the lies by watching the eye movements.
A follow-up study involved analysing videos of high-profile press conferences in which people appealed for help in finding missing relatives, or claimed to have been victims of crime. While some were telling the truth, others turned out to be lying.
Again, there was no evidence of a correlation between lying and eye movements.
The research appears in the online journal Public Library of Science ONE.