Emotions change from one moment to the next. They have a duration from seconds to hours and then transition to other emotions. Here, we describe the early ontology of these key aspects of emotion dynamics. In five cross-sectional studies (N = 904) combining parent surveys and ecological momentary assessment, we characterize how caregivers' perceptions of children's emotion duration and transitions change over the first 5 years of life and how they relate to children's language development. Across these ages, the duration of children's emotions increased, and emotion transitions became increasingly organized by valence, such that children were more likely to transition between similarly valenced emotions. Children with more mature emotion profiles also had larger vocabularies and could produce more emotion labels. These findings advance our understanding of emotion and communication by highlighting their intertwined nature in development and by charting how dynamic features of emotion experiences change over the first years of life.
Supplementary information: The online version contains supplementary material available at 10.1007/s42761-024-00248-y.
Keywords: Emotion development; Emotion dynamics; Emotion labels; Language learning.
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