Finding patterns and learning words: Infant phonotactic knowledge is associated with vocabulary size

Area of Science:

• Developmental Psychology
• Linguistics
• Cognitive Science

Background:

• Native language statistical regularities, known as phonotactic patterns, may aid infants in learning new words.
• Understanding the relationship between an infant's phonotactic knowledge and their vocabulary development is crucial for early language acquisition research.

Purpose of the Study:

• To investigate the association between infants' native language phonotactic knowledge and their word learning progress, assessed by vocabulary size.
• To determine if infants with less robust phonotactic knowledge exhibit enhanced learning of novel phonotactic patterns.

Main Methods:

• A corpus of nonce words with novel, "illegal" English phonotactic patterns was presented to 19-month-old infants.
• Infants' learning of these novel phonotactic patterns was assessed, correlating with their existing vocabulary size and general cognitive abilities.

Main Results:

• Infants with smaller vocabularies demonstrated significantly stronger learning of the novel phonotactic patterns compared to infants with larger vocabularies.
• This effect persisted even after controlling for general cognitive abilities, indicating a specific link to phonotactic learning.

Conclusions:

• Developing knowledge of native language structure, specifically phonotactics, may provide a foundational support for vocabulary development.
• Infants with smaller vocabularies might benefit more from phonotactic cues due to weaker existing phonotactic knowledge.
• Existing vocabulary knowledge may enhance the ability to detect phonotactic patterns, even in infancy.