Early assessment of phonetic and phonological development requires knowledge of typical versus atypical speech patterns, as well as the range of individual developmental trajectories. The nature of data reporting in previous literature on typical voicing acquisition left aspects of the developmental process unclear and limited clinical applicability. This work extends a previous four-month group study to present data for one child over 12 months. Words containing initial /b p d t/ were elicited from a monolingual English-speaking 2-year-old child biweekly for 25 sessions. Voice onset time (VOT) was measured for each stop. For each consonant and recording session, we measured range as well as accuracy, overshoot and discreteness calculated for means and individual tokens. The results underscore the value of token-by-token analyses. They further reveal that typical development may involve an extended period of fluctuating voicing patterns, suggesting that the voiced/voiceless contrast may take months or years to stabilise.
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Article Synopsis
- Variability in speech input can help infants learn sound contrasts, as it may highlight individual cues or reveal stable relationships between them.
- The study focuses on the relationship between Voice Onset Time (VOT) and F1 formant frequency in German, showing that adults use these cues to differentiate voiced and voiceless stops based on a trading relation.
- Infants, at six months, show a preference for speech in which phonetic cues align with the adult trading relation rather than a reversed relation, indicating their ability to discern these sound patterns.
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