The authors explored predictions from basic emotion theory (BET) that facial emotion expression recognition skills are insular with respect to their own development, and yet foundational to the development of emotional perspective-taking skills. Participants included 417 preschool children for whom estimates of these 2 emotion understanding variables and receptive language skills were obtained at 2 time points, separated by 24 weeks. Path results for autoregressive cross-lagged structural equation models revealed support for the BET predictions for younger preschoolers (ages 36 to 48 months). In contrast, results for older preschoolers (ages 49 to 67 months) revealed bidirectional influences between receptive language and emotion understanding consistent with constructionist theories of emotion. Findings support a hybrid model in which associations between receptive language and emotion understanding skills are initially nonsignificant and become significant over time. The implications of emotion expression recognition as an early toehold for the development of more advanced emotion understanding skills are discussed.