Earlier false belief understanding predicts later lie‐telling behavior in preschool children, but not vice versa

Young children's lie‐telling behavior is associated with their theory of mind (ToM) development. However, current evidence is primarily based on cross‐sectional studies, with very little longitudinal evidence on the causal relation between the two constructs. The current study provided much‐needed cross‐lagged longitudinal evidence on the association between ToM and lying in young children. Adopting a short‐term longitudinal design, we tested 104 normally developing children's (64 boys, M = 54.0 months) false belief understanding and lie‐telling behaviors three times at 4‐month intervals. Results showed the cross‐lagged model fit the data well. Lie‐telling behaviors exhibited moderate stability across the three time points, while ToM exhibited moderate stability between the first two time points but not between Time 2 and Time 3. Earlier false belief understanding significantly predicted children's later lie‐telling behavior, controlling for family socioeconomic status, child age, gender, only child status, and Time 1 verbal ability and inhibitory control. On the contrary, earlier lie‐telling did not predict later false beliefs understanding. We concluded that earlier false belief understanding predicts later lie‐telling behavior in preschool children, but not vice versa.