Examined association of three maternal regulating behaviors with children's positive and negative behaviors toward siblings in 40 Japanese families. Observed maternal regulating behaviors more frequently when younger sibling was still in early developmental stage. Older siblings' negative behaviors toward younger positively correlated with…

Examined how Japanese 2- and 4-year-olds assigned meaning to novel nouns associated with familiar and unfamiliar animals and inanimate objects. Found that in the absence of useful information from syntax, the 2-year-olds were able to fast map a noun to its meaning by elegantly coordinating word-learning biases and other available sources of…

Surveyed fourth-, seventh-, and tenth-graders in Japan and the United States regarding evaluations of peer group exclusion of atypical peers. Found that with increasing age, children demonstrated sensitivity to context (reason the peer was different) and believed that the excluded child should not change to be accepted. Girls were less willing to…