Frequent vs. infrequent words shape toddlers' real-time sentence comprehension

Area of Science:

• Developmental Psychology
• Psycholinguistics
• Child Language Acquisition

Background:

• Children's real-time language comprehension is influenced by both word frequency and linguistic context.
• Understanding how toddlers process novel words in different sentence frames is crucial for language development research.

Purpose of the Study:

• To investigate the impact of noun frequency and sentence frame typicality on toddlers' real-time comprehension.
• To determine if toddlers' vocabulary size moderates the effect of noun frequency on comprehension.

Main Methods:

• Monolingual English-learning toddlers participated in a picture-word verification task.
• Sentences featured typical or atypical frames paired with high- or low-frequency nouns.
• Comprehension accuracy was measured in real-time.

Main Results:

• Toddlers demonstrated comparable comprehension accuracy for nouns presented in both typical and atypical sentence frames.
• Comprehension accuracy was significantly lower for low-frequency nouns compared to high-frequency nouns.
• The negative effect of low-frequency nouns was more pronounced in toddlers with smaller expressive vocabularies.

Conclusions:

• Toddlers possess the capacity to comprehend nouns across varied sentence contexts.
• The gradual development of lexical representations impacts toddlers' ability to recognize less frequent words.
• Vocabulary size plays a significant role in the efficiency of word recognition during early language acquisition.