Phonology, Semantics, and the Comprehension-Expression Gap in Emerging Lexicons.

Area of Science:

• Developmental Psychology
• Linguistics
• Child Language Acquisition

Background:

• Children typically understand many words by 12 months but produce few.
• The comprehension-expression gap in early language development is not fully understood.

Purpose of the Study:

• To investigate linguistic factors predicting word production in toddlers.
• To determine if phonological neighborhood density, semantic neighborhood density, and word frequency (WF) predict spoken vocabulary.

Main Methods:

• Analyzed monosyllabic words from the active and passive lexicons of 201 Dutch toddlers.
• Utilized the Dutch Communicative Development Inventory (2002).
• Applied a generalized linear mixed-effects model to assess predictors of word production.

Main Results:

• Phonological neighborhood density and word frequency significantly predicted whether a understood word was spoken.
• Semantic neighborhood density did not significantly predict word production.
• Individual differences were observed in the effect of word frequency on spoken vocabulary.

Conclusions:

• The phonological properties of words influence their learnability and production, contributing to the comprehension-expression gap.
• Individual variations in how ambient language statistics affect children's lexicons warrant further longitudinal investigation.