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The current research investigated the organization of the second language mental lexicon. Twenty-seven English-Hebrew bilingual speakers (who spoke Hebrew as their second language) completed a semantic fluency task in each of their languages, and 24 native Hebrew speakers completed the task in Hebrew. Responses were compared within and across groups, using computational tools. The analyses indicated that the lexical network of the second language displayed greater local connectivity and less modular community structure than the network in the native language, both in the entire sample and in a sub-sample of bilinguals whose Hebrew vocabulary was matched to that of the native Hebrew speakers. These findings suggest that the lexical network of the second language is not as well-organized as is the network of the first language, even in highly proficient bilinguals. The structural characteristics …