Good lying takes two skills that children must learn
Children who grasp that others do not know what they know, and can keep a straight face, lie earlier and better.
TED · Can you really tell if a kid is lying? | Kang LeeA convincing lie is less about dishonesty than about brainpower. To lie well, a child has to do two hard mental jobs at once, and children who can do both become better liars sooner.
That is the finding of Kang Lee, a researcher who has studied children's lying for 20 years. He says the first job is mind reading.
Mind reading, in his use of the term, does not mean psychic powers. It means understanding that someone else may not know what you know about a situation, and keeping straight what I know versus what you know. Lying depends on that gap. As Lee puts it, "the basis of lying is that I know you don't know what I know. Therefore, I can lie to you."
The second job is self-control. A good liar has to control speech, facial expression, and body language well enough to make the false story believable. A child may know the parent missed what happened, but still give herself away by blurting out too much, looking nervous, or fidgeting.
Lee and his colleagues found that young children with stronger mind reading and self-control skills tell lies earlier, and tell more sophisticated ones. The same two abilities, he notes, help all of us function in society, and problems with them are associated with developmental conditions such as ADHD and autism.
The takeaway is counterintuitive for parents. A toddler's first lie can signal typical development, not bad character. It shows the child has learned that other minds do not automatically contain the same information, and has gained enough control to act on that insight.
Questions people ask
When do children normally develop theory of mind?
Theory of mind usually develops rapidly between ages three and five, as children learn through play, conversation, and watching how people react. Researchers test it with simple tasks, like asking a child what another person will expect when that person has not seen something moved. Most children pass those tests by around age four.
Can parents help children build self-control?
Yes. Self-control, often called executive function, improves through sleep, regular routines, and practice waiting, taking turns, and following rules. Games that require stopping and starting, like Simon Says or musical chairs, give children repeated practice in controlling speech and movement.
Are mind reading and self-control useful for anything besides lying?
No. Adults use the same two skills in polite conversation, negotiation, teaching, and keeping surprises. Mind reading lets you tailor what you say to what someone else already knows, and self-control lets you stay calm, listen, and avoid blurting out something hurtful or confidential.