A progressive consonant-substitution pattern in a typically developing child.

Area of Science:

• Linguistics
• Developmental Psychology
• Speech-Language Pathology

Background:

• Early speech development involves acquiring complex sound systems.
• Consonant substitution patterns are common, but individual variations exist.
• Understanding these patterns provides insight into typical and atypical language acquisition.

Purpose of the Study:

• To document and explain a unique consonant [l] substitution pattern in a typically developing child's early vocabulary.
• To analyze the progression and linguistic contexts of this specific substitution.
• To explore the underlying phonetic, phonological, and developmental factors contributing to the observed pattern.

Main Methods:

• Longitudinal audiotape recording of a child's speech from 2;2 to 2;8 (years;months).
• Analysis of consonant repertoire and feature presence in each recording period.
• Detailed examination of [l] substitutions across different phonetic environments and word positions.

Main Results:

• The child exhibited a consistent [l] substitution for /w/, fricatives (/s/, /z/, /[Formula: see text]/), /r/ in clusters, initial /j/, and in word-liaison contexts.
• Substitution patterns evolved over time, showing developmental progression.
• Phonetic features, consonant-vowel interactions, and syllable position influenced the substitution's manifestation.

Conclusions:

• The observed [l] substitution pattern is explained by a combination of universal linguistic tendencies and child-specific factors.
• This case provides further evidence for the significant variability in speech sound development among typically developing children.
• The study contributes to understanding the mechanisms driving phonological development and potential deviations.