Which type of evidence most directly informs whether bilingual children have separate lexicons or a shared lexicon?

Which type of evidence most directly informs whether bilingual children have separate lexicons or a shared lexicon?

• A. Neuroimaging showing separate representations
• B. Cross-language interference in tasks
• C. Bilingual lexical access studies
• D. Behavioral similarity across languages

Answer: (A)

Think about how we know where a bilingual child stores words in memory. The most direct clue comes from looking inside the brain to see how words from each language are encoded. Neuroimaging that shows separate representations means the brain is forming distinct neural patterns for words in one language versus the other. That direct neural separation points to separate lexical stores rather than a single, shared dictionary, because it reveals where and how the word entries are actually encoded and organized across languages. Behavioral patterns, like interference in tasks or similarities in responses across languages, can reveal that languages interact or share some processing, but they don’t tell us definitively how the mental lexicon is organized at the representation level. They show effects of processing, not the structure of lexical memory itself. So while those methods provide valuable information about processing and use, neuroimaging directly addresses whether the representations themselves are distinct, making it the best evidence for separate lexicons.

Think about how we know where a bilingual child stores words in memory. The most direct clue comes from looking inside the brain to see how words from each language are encoded. Neuroimaging that shows separate representations means the brain is forming distinct neural patterns for words in one language versus the other. That direct neural separation points to separate lexical stores rather than a single, shared dictionary, because it reveals where and how the word entries are actually encoded and organized across languages.

Behavioral patterns, like interference in tasks or similarities in responses across languages, can reveal that languages interact or share some processing, but they don’t tell us definitively how the mental lexicon is organized at the representation level. They show effects of processing, not the structure of lexical memory itself. So while those methods provide valuable information about processing and use, neuroimaging directly addresses whether the representations themselves are distinct, making it the best evidence for separate lexicons.