Contributions to individual differences in preschoolers' identificatio
n of basic emotional expressions and situations, emotion language, and
their self-generated causes for basic emotions (happy, sad, angry, an
d afraid) were investigated across parts of 2 preschool years (N = 47;
initial M age = 41 months). An aggregate of preschool emotion underst
anding was predicted by the intrapersonal predictors, child age and ov
erall cognitive-language ability. Observed socialization, including ex
planations about emotions, and positive and negative responsiveness to
child emotions predicted the aggregate of emotion understanding, even
with age and cognitive-language ability partialed. The contribution o
f socialization predictors to emotion understanding was moderated by s
ex only for negative emotional responsiveness, and children with the l
owest emotion understanding scores had mothers who showed more anger.