Victoria Talwar, a professor of educational and counseling psychology at McGill University, has spent years watching how children lie—and a landmark study she led has turned a common worry on its head: most childhood lying does not predict serious problems later in life.
The finding matters because parents and teachers often fear that a child who lies frequently has stepped onto a path toward delinquency. It's a reasonable worry, backed by intuition, but Talwar's research suggests the reality is more reassuring—and more nuanced. Most children, her team discovered, show low or declining levels of lying as they grow up. For them, lying is simply part of development, not a signal of trouble ahead.
The study, conducted by researchers from McGill University, Université de Montréal, and John Jay College of Criminal Justice in New York City, tracked 3,017 children from ages 6 to 25. The participants came from the Quebec Longitudinal Study of Kindergarten Children, which began in 1986 and 1988. Two thousand were randomly selected as a representative sample, while an additional 1,017 were included because they showed behavioral problems at the time of selection. Parents and teachers reported on the children's lying behavior from ages 6 to 19, allowing researchers to map out distinct patterns—what Talwar calls "lying trajectories"—over time. Then the team checked whether these patterns connected to early childhood traits like aggression and impulsivity, and later to psychiatric symptoms at age 22 and criminal records through age 25.
The distinction emerged clearly: not all lying looks the same across development. Some children lie occasionally and then less. Others start out rarely lying and maintain that pattern. But a smaller group lies frequently or shows increasing lying over time, and this matters. Children whose lying persisted or intensified were significantly more likely to display early aggression and impulsivity. Later, as young adults, they were more likely to show anti-social personality symptoms and have criminal convictions.
The implications are significant for how we respond to children's dishonesty. Talwar emphasizes that the key is distinguishing between normal development and patterns that might benefit from early intervention. "Persistent and increasing lying across time—especially when in combo with aggression and impulsivity—could signal the need for early support and intervention, rather than just reactive punishment," she noted in describing the findings, which were published in Development and Psychopathology.
For parents and educators, the message is reassuring: one lie, or even a period of occasional lying, does not forecast a child's future. But patterns matter. A child whose lying increases over years, especially alongside other behavioral red flags, may benefit from supportive, proactive help rather than simple punishment. The research helps reduce stigma around childhood lying—a nearly universal behavior—while also clarifying which situations warrant closer attention.
Talwar, whose career has centered on understanding children and truthfulness, hopes future research will follow individuals even further into adulthood to examine social, occupational, and relational outcomes. For now, this study offers something valuable: a more compassionate and evidence-based way to think about why children lie, and what it might mean when they do.