The acquisition of Korean word-initial stops

Area of Science:

• Phonetics
• Developmental Linguistics
• Acoustic Phonetics

Background:

• Stop voicing contrast acquisition is studied via voice onset time (VOT).
• Korean word-initial stops present a unique three-way contrast (fortis, aspirated, lenis) differentiated by multiple acoustic parameters, not just VOT.
• Existing research lacks detailed developmental analysis of Korean stop acquisition.

Purpose of the Study:

• To examine the developmental patterns of Korean word-initial stop production in children.
• To compare children's acoustic-phonetic productions with adult speech.
• To identify universal and language-specific phonetic patterns in early speech development.

Main Methods:

• Acoustic analysis of voice onset time (VOT), fundamental frequency (F0), and harmonic amplitude differences.
• Production data from 40 Korean children (ages 2;6 to 4;0) and 10 adult females.
• Monosyllabic, near-minimal triplets across three places of articulation (labial, alveolar, velar).

Main Results:

• Children's productions show both universal phonetic patterns and Korean-specific variations.
• Language-specific fundamental frequency (F0) variation emerges by 2;6 but is mastered later than VOT.
• Younger children exhibit greater acoustic overlap across stop categories, which decreases with age compared to adults.

Conclusions:

• Speech sound development involves both universal phonetic tendencies and language-specific complexities.
• Understanding language-specific phonetic details is crucial for a comprehensive view of child speech acquisition.
• The mastery of VOT and F0 distinctions in Korean stops develops progressively through early childhood.