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The present study investigated lexical production and innovation of 202 participants across six groups: child and adult heritage speakers of Russian, dominant in Hebrew or American English, and monolingual Russian-speaking children and adults. Understanding quantitative performance across these six groups was intended to provide a comprehensive perspective on heritage language (HL) development, while comparing the participants’ qualitative non-target response patterns would elucidate the organization of the HL lexicon. We assessed the production of Russian nouns and verbs using a naming task. We then considered the effects of input at the societal and lexical levels (focusing on word frequency and age of acquisition). Our findings are discussed in terms of accounts of HL developmental trajectories: monolingual-like trajectory, frozen lexical development, attrition, and new language variety in a contact situation. The results presented no evidence for attrition, while elements of the other three trajectories were found in our quantitative and qualitative analyses.
