Does size matter? Subsegmental cues to vowel mispronunciation detection

Area of Science:

• Developmental Psychology
• Linguistics
• Speech Perception

Background:

• Children's ability to recognize familiar words is crucial for language acquisition.
• Previous research indicates sensitivity to consonant mispronunciations, but less is known about vowel mispronunciation processing.

Purpose of the Study:

• To investigate whether children exhibit a graded sensitivity to different degrees of vowel mispronunciations in familiar words.
• To determine the age at which children develop sensitivity to vowel mispronunciations and the factors influencing this ability.

Main Methods:

• Testing children aged 1.5 and 2 years on their recognition of familiar objects with labels containing 1-, 2-, or 3-feature vowel mispronunciations.
• Increasing trial length to allow more time for response formation.

Main Results:

• One-and-a-half-year-olds did not show graded sensitivity to vowel mispronunciations, even with extended trial durations.
• Two-year-olds demonstrated a clear sensitivity to the size of vowel mispronunciations, distinguishing between smaller and larger errors.
• The observed graded sensitivity in two-year-olds may be better explained by acoustic properties of the mispronunciations rather than detailed phonemic features.

Conclusions:

• Early lexical representations may encode acoustic information about vowels, influencing word recognition.
• Sensitivity to graded vowel mispronunciations develops around two years of age.
• Acoustic characteristics play a significant role in how young children process vowel variations in familiar words.