Individual differences in phonological development: ages one and three years.

Area of Science:

• Child Development
• Linguistics
• Speech-Language Pathology

Background:

• Individual differences in phonological development emerge early.
• Understanding the persistence of these differences is crucial for early intervention.

Purpose of the Study:

• To investigate the stability of phonological development from 1 to 3 years.
• To identify early predictors of later phonological skills.
• To examine the relationship between cognitive style and phonological organization.

Main Methods:

• Longitudinal study of 10 typically developing children from 9-17 months and at 36 months.
• Analysis of spontaneous mother-child interaction recordings and administered phonological/cognitive probes.
• Categorization of phonological errors into segmental and prosodic types.

Main Results:

• Early preference for specific phonological categories did not predict later mastery.
• High use of true consonants in vocalizations at 1 year predicted greater phonological advancement by 3 years.
• Children showed consistent individual differences in intelligibility, error types (segmental vs. prosodic), and cognitive/learning styles related to phonology.

Conclusions:

• Early consonant production is a significant predictor of later phonological development.
• Individual differences in phonological skills and cognitive-phonological organization are stable from infancy to toddlerhood.
• Distinguishing between segmental and prosodic errors aids in understanding developmental trajectories.