Vowel categorization during word recognition in bilingual toddlers

Area of Science:

• Linguistics
• Developmental Psychology
• Phonetics

Background:

• Spanish and Catalan have different vowel systems, with Catalan having more vowels in a region where Spanish has only one.
• This phonetic overlap may create challenges for young language learners, particularly bilingual children.
• Understanding phonological knowledge in early language acquisition is crucial for cognitive development.

Purpose of the Study:

• To investigate phonological knowledge of word forms in Spanish-learning, Catalan-learning, and bilingual toddlers and preschoolers.
• To examine how differences in vowel systems between Spanish and Catalan affect word recognition in monolingual and bilingual children.
• To determine if bilingual children differentiate vowel contrasts unique to one of their languages.

Main Methods:

• Children (toddlers and preschoolers) were presented with picture pairs.
• Target word pronunciations were manipulated by altering vowels, creating changes within a language or only contrastive in one language.
• Children's visual attention to target pictures served as the measure of word recognition.

Main Results:

• Monolingual children demonstrated sensitivity to vowel changes within their native language but not to non-native changes.
• Bilingual toddlers did not show sensitivity to vowel changes that were only contrastive in Catalan.
• Catalan-dominant bilingual preschoolers showed sensitivity to Catalan-specific vowel contrasts, unlike Spanish-dominant bilinguals.

Conclusions:

• Monolingual children possess robust knowledge of native-language vowel categories.
• Bilingual children with overlapping vowel categories in their languages may not process these categories distinctly during language comprehension.
• Early bilingual language acquisition involves complex interactions with phonological systems, potentially leading to merged phonetic categories.