Psychological studies examine deception and Munchausen syndrome

Research from the University of Marburg in Germany indicates that lying requires significantly higher cognitive effort than telling the truth. According to researchers Tabea Wächtershäuser and Kristina Suchotzki, the process of deception involves constructing plausible narratives, avoiding contradictions, and inhibiting spontaneous, truthful responses. This mental load can manifest through unexpected hesitations, forced explanations, or unusual emotional reactions, though these are not definitive proof of lying.

Separately, medical insights regarding Munchausen syndrome describe a psychological disorder where individuals feign, exaggerate, or induce illness to assume the role of a patient and receive attention. The UK National Health Service (NHS) notes that affected individuals may falsify medical results or report non-existent symptoms. A severe variation, known as Munchausen syndrome by proxy, involves a caregiver fabricating or inducing illness in a person under their care, which is classified as a form of abuse.