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The internet has given rise to new forms of deceit and misinformation, including phishing attacks, romance scams and fake news. While many psychological studies have investigated the factors that influence people's ability to tell if others are lying in person, lie detection online has seldomly been explored and understood.
Researchers recently carried out a study aimed at better understanding why people are deceived online. Their paper, published in Communications Psychology, outlines interesting patterns underlying the detection of lies online.This trend has worsened since the COVID-19 pandemic and is worsening with the advent of generative AI. Now, before we can help people detect online scams, we need to understand why people fall for them in the first place.
As both scams and fake news are rooted in lies,  researchers first reviewed past literature focusing on lie detection. They found that most previous works focused on offline contexts, where people can also try to detect lies based on subtle cues, such as a person's tone of voice, their gaze and body language.
In online settings, we typically cannot rely on such cues. So researchers decided to find out why people can be particularly bad at detecting lies, and thus scams, in an online context.
They examined what cues people used to judge others' honesty. For example, did they think others lied when they themselves did? Did they think others lied when the other person reported having a rare card? And did they think others lied when they themselves lost?When they analyzed the data they collected, the researchers observed two fascinating patterns. First, they observed that people were more suspicious of others if they had themselves lied during the game they played as told to do so by the researchers, but also when other players had reported holding a statistically unlikely card.
Researchers  also compared the behaviour of players to the predictions of an artificial, simulated lie detector, Interestingly, they found that poor lie detection was associated with an over-reliance on one's own honesty (or dishonesty) and an under-reliance on statistical cues.These findings imply that honest people may be particularly susceptible to scams, because they are the least likely to suspect a lie and thus detect a scam.
Moreover, as social media platforms use recommendation systems that feed people with more of the same content they like, these systems distort the likelihood of seeing certain information—fake news included. People's natural reliance on statistical likelihoods to infer what is true thus will not work well in these contexts.
This recent work  sheds some new light on the factors underpinning people's ability to detect others' deceptions online. In the future, they could guide the efforts of policymakers and technology firms who are working to prevent internet users from falling into the traps of scammers and platforms disseminating false information.These findings led to the idea of creating an 'adversarial training' to help people detect online scams.That is, people may get better at detecting scams after engaging with scam creation themselves. Initial results looking at detection of phishing e-mails look promising and researchers now aim to test this further in other contexts.
Sarah Ying Zheng et al, Poor lie detection related to an under-reliance on statistical cues and overreliance on own behaviour, Communications Psychology (2024). DOI: 10.1038/s44271-024-00068-7

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