This study examines the role of agency in a young trilingual child's language choice in interaction with her Mandarin-speaking grandparents. The child was born in Japan to a Chinese mother and a Japanese father. English is used as a lingua franca in the family. The study demonstrates how the child asserts her agency to negotiate the decisions and…

The acquisition of verb morphology is often studied using categorical criteria for determining the productivity of a morpheme. Applying this approach to Japanese, an agglutinative language, this study finds no consistent order for morpheme acquisition and that productivity could be explained by sampling effects. To examine morpheme acquisition…

Mental state terms are believed to be closely related to the development of Theory of Mind (ToM). This study focuses on mental state verbs (MSVs) and investigates how they are used by Japanese-speaking mother-child dyads compared to their English-speaking counterparts. Analyses of their spontaneous speech from the CHILDES archives show that…

The development of metalinguistic awareness for linguistic politeness was examined in 68 Japanese-speaking children aged between three and five years old. A politeness judgement task was administered together with several phonological judgement tasks and false-belief tasks. Four- and five-year old Japanese children, but not three-year-olds, made…

This article reports on the development and use of the Developmental Sentence Scoring for Japanese (DSSJ), a new morpho-syntactical measure for Japanese constructed after the model of Lee's English Developmental Sentence Scoring model. Using this measure, the authors calculated DSSJ scores for 84 children divided into six age groups between 2;8…