Can you really tell if a kid is lying? | Kang Lee

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Undergraduates, professionals who work with children, law-enforcement personnel, and parents detect children’s lies at roughly chance levels.
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A remote, noninvasive, inexpensive technology reportedly detects lies from facial blood flow with approximately 85% accuracy.
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When people lie, blood flow decreases in their cheeks and increases in their noses.
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In a guessing game, 30% of two-year-olds lied, versus 50% of three-year-olds and over 80% of four-year-olds.
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A regular video camera and image processing can reveal subtle facial blood-flow changes tied to hidden emotions.
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Children with stronger theory of mind and self-control lie earlier and tell more sophisticated lies.
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A child cannot lie effectively without theory of mind, recognizing that another person knows something different.
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During video calls, facial imaging could monitor heart rate, stress, mood, pain, and eventually cardiovascular risk.
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Children often look neutral while fear, guilt, shame, and pleasure flash briefly or stay hidden.
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Facial imaging could identify students highly anxious about a lesson, helping teachers provide targeted support.
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Physiological imaging technology could fundamentally change how humans detect and understand lying.

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