Statistical frequency in perception affects children's lexical production.

Area of Science:

• Developmental Psychology
• Cognitive Science
• Speech Perception and Production

Background:

• Early word production in children is shaped by the statistical properties of speech.
• The role of perceptual learning in linking speech sound frequency to word production requires further investigation.
• Understanding how children learn from speech sound variability is crucial for early language acquisition.

Purpose of the Study:

• To determine if perceptual learning, sensitive to word-token frequency or variability, explains the influence of speech sound statistics on children's word production.
• To investigate the impact of talker consistency on the relationship between nonword frequency and production accuracy in young children.

Main Methods:

• Three experiments exposed four-year-old children to frequent (10 presentations) and infrequent (1 presentation) nonwords.
• Nonwords were presented by either a single talker or multiple talkers.
• Children's production of these nonwords was assessed for errors and response latencies.

Main Results:

• No significant effect of perceptual frequency on production was observed when frequent nonwords were spoken by the same talker.
• Children produced frequent nonwords with fewer errors and shorter latencies when they were spoken by different talkers.
• This suggests that token variability, not just frequency, plays a key role in perceptual learning for speech production.

Conclusions:

• Perceptual learning is sensitive to token variability in speech, influencing children's early word production.
• Exposure to varied talkers enhances the learning of frequent nonwords, improving subsequent production.
• Token variability appears to be a critical factor in how children learn and produce new words.