Consonants and vowels: different roles in early language acquisition

Area of Science:

• Cognitive Science
• Developmental Psychology
• Linguistics

Background:

• Language acquisition involves learning vocabulary (lexicon) and grammar (syntax).
• The distinct acoustic properties of consonants and vowels suggest potential differential roles in language processing.

Purpose of the Study:

• To investigate whether infants differentiate the roles of consonants and vowels in early language acquisition.
• To determine if infants utilize consonantal information for word identification and vocalic information for structural learning.

Main Methods:

• Two experimental paradigms were used with 12-month-old infants.
• Experiment 1 assessed word identification based on the consonantal tier.
• Experiment 2 evaluated the extraction and generalization of structures based on the vocalic tier.

Main Results:

• Infants relied more on the consonantal tier for word identification.
• Infants demonstrated superior ability in extracting and generalizing repetition-based structures over the vocalic tier.
• These findings suggest infants exploit functional differences between consonants and vowels.

Conclusions:

• Infants can differentiate and utilize the functional roles of consonants and vowels early in language acquisition.
• Distinct learning mechanisms may be assigned to basic speech categories (consonants and vowels) to support lexicon and syntax development.