Children's acquisition of directional verbs in sign languages has received a lot of attention, but less is known about the sociocultural process of using these verbs, especially in the context of emerging sign languages in diverse language ecologies. Directional verbs are a common grammatical phenomenon of many sign languages in which some verbs…

Child language acquisition research has provided ample evidence of lexical frequency effects. This corpus-based analysis introduces a novel frequency measure shown to significantly constrain adult language variation, but heretofore unexplored in child language acquisition research. Among adults, frequent occurrence of a form in a particular…