Lexical acquisition and acquisition of initial voiceless stops

Area of Science:

• Child language acquisition
• Phonological development
• Speech acoustics

Background:

• Lexical acquisition and phonological development are key areas in child language research.
• Understanding the relationship between word learning and sound production provides insights into developmental trajectories.
• The emergence of specific speech sounds, like initial voiceless stops, is a critical milestone.

Purpose of the Study:

• To investigate the relationship between lexical acquisition and the production accuracy of initial voiceless stops in young children.
• To examine how word frequency and the timing of word entry into a child's lexicon relate to the development of accurate voiceless stop production.
• To test predictions derived from the lexical diffusion model of sound change.

Main Methods:

• Acoustic analysis of token-by-token production accuracy of initial voiceless stop targets.
• Examination of children's lexicons, including word frequency and age of word entry.
• Longitudinal data collection from two typically developing children aged 1;9 and 1;10.

Main Results:

• Fewer than half of the words in the children's lexicons showed accurate initial voiceless stop production before the voicing contrast was established.
• Accurate production of initial voiceless stops was more likely to emerge in 'old' words already present in the lexicon.
• Newly acquired words were less likely to feature accurate initial voiceless stop production during the study period.

Conclusions:

• The findings support the lexical diffusion model, suggesting sound changes spread through the lexicon over time.
• Early lexical knowledge influences the timing and emergence of accurate phonological contrasts.
• Developmental phonology research can benefit from integrating lexical and phonetic analyses.