This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: From The Traitors to everyday life, we often mistake nervousness, confidence or group suspicion for signs of deception. Dr Nadja Heym, Associate Professor in Personality Psychology and Psychopathology, explains why spotting a liar is harder than we think.
Why is it so hard to spot a liar? The psychology of deception | Nottingham Trent University Not as well as you would think. Research consistently shows that most people perform only slightly better than chance when detecting lies.
We often rely on stereotypes, such as avoiding eye contact or appearing nervous, but these are poor indicators of deception. Our capacity to empathize can shape how well we can understand and interpret others' intentions and behavior, sometimes allowing us to detect their lies. Likewise, our capacity to take another person's perspective allows us to lie or manipulate others.
Some personality traits (such as schizotypy, neuroticism or low agreeableness) also shape how we interpret others' behavior and can bias our perceptions, leading us to see deception where none exists and be more distrusting of people. In my own research, dark personality traits such as psychopathy or Machiavellianism are associated with increased deception and interpersonal manipulation. In groups, a compelling narrative can become more influential than objective evidence itself, and we may stop looking for counterevidence.
Once we detect some inconsistencies and suspicion takes hold, people tend to seek evidence that confirms their beliefs and overlook evidence that contradicts them (it's called confirmation bias). We often judge people based on how well their behavior fits (and confirms) our expectations (which might be further biased by our stereotypes or manipulated through the spreading of misinformation) rather than whether they are actually guilty. Suspicion is highly contagious.
Humans are social learners, so when several people express doubt about someone, the power of perceived consensus kicks in, and others begin to reassess that person through the same lens. Group discussions can amplify suspicions, creating a snowball effect where confidence in a judgment grows even when evidence does not. Moreover, "groupthink" is a psychological phenomenon in which the desire for harmony, agreement or cohesion within a group overrides critical thinking and objective evaluation of alternatives.
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