What happened in this episode?
Psychologist and deception researcher Dr Leanne Ten Brinke discusses what empirical research does—and does not—support about spotting lies and ‘dark’ personality traits. She cites work suggesting observers can form moderately accurate first impressions of psychopathic traits from very brief video clips, while stressing that personality assessment improves with time and context. Drawing on her PhD research into televised appeals by people seeking missing loved ones, she says a model using two verbal and two non-verbal cues initially classified deceptive versus genuine ‘pleaders’ with about 90% accuracy, but that later replication attempts produced much more modest effects.
On everyday lie detection, Ten Brinke says people average only about 54% accuracy when judging deception from videos, and argues that better questioning—open-ended prompts, unanticipated follow-ups, and checks for verifiable detail—outperforms folk beliefs about body language. She says gaze aversion is not supported as a reliable cue to lying and notes research indicating autistic people may be wrongly perceived as deceptive due to eye-contact expectations. Ten Brinke also describes lab findings linking lying with increased cortisol reactivity.
The conversation turns to the ‘dark tetrad’ (psychopathy, Machiavellianism, narcissism and sadism), including prevalence estimates and developmental influences combining genetics and environment. Ten Brinke challenges the idea of ‘successful psychopathy’, saying her research found higher psychopathic traits linked to less influence in government and lower earnings among hedge fund managers. She outlines practical strategies for handling harmful personalities at work and in relationships, including explicit boundaries and avoiding face-to-face negotiations when manipulation or violence is a concern.
