We applied the use of thermography to cognitive neuropsychology, particularly as an objective marker of subjective experiences, in the context of lying. We conducted three experiments: (a) An important lie was invented by the participants in 3 min, and it was recounted by phone to a significant person while they were recorded by the thermographic camera, obtaining a face and hands map of the lie. (b) A similar methodology was carried out, but adding the Cold Stress Test (CST) of the dominant hand during the phone call, obtaining a second physiologic marker (the percentage of thermal recovery) to detect the lie. Further, it established a control condition where it generated anxiety in the participants using IAPS images with negative valence and high arousal, which were described by phone to a loved one. We obtained results that showed significant correlations between changes in body temperature and mental set. Of particular interest was the temperature of the nose and hand, which tended to decrease during lying (Experiment 1). The participants also showed a lower recovery of the temperature after the CST when they were lying (Experiment 2). (c) Experiment 3 is a replication of Experiment 2 but with a different type of lie (a more ecological task) in a different scenario (following the ACID interview, with the use of the phone eliminated and participants motivated to lie well). The main pattern of results was replicated. We obtained an accuracy of 85% in detection of deception with 25% of false alarms.

Lying during childhood is a common concern for caregivers. Lee et al. (2014) showed that a moral story and instruction implying reinforcers for honesty produced statistically significant improvements in children admitting a transgression. We evaluated the influence of this moral story and instruction on the consistency of honest reports when reinforcement favored lying in the context of reporting answers to math problems. The moral story and instruction produced temporary, inconsistent, or null effects across participants. However, reinforcing accurate reports produced consistent improvements in telling the truth.

Lying during childhood can have a negative impact on the quality of relationships between caregivers and children. Although caregivers have identified lying as a major concern, few studies have evaluated the conditions under which lying about socially significant events is more or less probable. This study extended Sauter et al. (2020) in two ways. First, we assessed the extent to which modified baseline procedures reliably evoked lies about homework completion or academic dishonesty. Second, we evaluated the effects of an intervention package comprised of praise‐based components recommended by professionals and supported by previous research. When the praise‐based intervention was ineffective, we implemented a tangible intervention comprised of rules, and differential reinforcement. All participants lied about academic dishonesty under baseline conditions and continued to do so when researchers implemented the praise‐based intervention. In contrast, the tangible intervention increased honest reports for all participants and decreased academic dishonesty for two of three participants. These effects were replicated in probe sessions conducted by one participant's mother.

We applied thermography to cognitive neuropsychology, particularly as a somatic marker of subjective experience during cognitive and emotional tasks. We found significant correlations between changes in facial temperature and mental set. Specifically, the temperature of the nose tended to decrease during emotional tasks and increase during cognitive tasks. However, for stress tests or high arousal reactions to emotional stimuli, the direction of the thermal change depended on the nature of the setting, real or simulated. Detection of deception is a mixed field where cognitive effort, physiological stress, and empathy have evolved, affecting the direction of the thermal variation—higher or lower temperature of the tip of the nose and forehead. We found that the temperature change of the nose and forehead may enable detecting when people lie about facts (the Pinocchio effect markers). In general, one important contribution is to recover mental thermometry as a potent tool for neurocognitive studies.

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