Auditory and categorical effects on cross-language vowel perception

Area of Science:

• Phonetics
• Linguistics
• Auditory Perception

Background:

• Cross-language speech perception research investigates how speakers of different languages perceive speech sounds.
• Acoustic properties of vowels, specifically F1-F2 space, are crucial in differentiating vowel categories.
• Understanding cross-language perception aids in second language acquisition (SLA) strategies.

Purpose of the Study:

• To investigate the role of universal, sensory-based factors in cross-language vowel perception.
• To examine how acoustic distance in F1-F2 space influences perceived vowel dissimilarity across language backgrounds.
• To explore the relationship between vowel perception and second language acquisition.

Main Methods:

• Participants (English monolinguals, native Spanish speakers) rated vowel dissimilarity across Spanish, English, and mixed-language pairs.
• Acoustic analysis using F1-F2 space to quantify vowel distances.
• An oddity discrimination task with adjacent and nonadjacent vowel triads was used in a second experiment.

Main Results:

• Perceived vowel dissimilarity increased with greater acoustic distance in F1-F2 space for all participants.
• Native English and Spanish speakers' ratings were similar for distant vowels but differed for adjacent vowels.
• Native English speakers outperformed native Spanish speakers in discriminating adjacent vowel triads, correlating with earlier dissimilarity judgments.

Conclusions:

• A universal, sensory-based component significantly influences cross-language vowel perception.
• Differential classification of phonetically similar vowels impacts perceived dissimilarity and is crucial for second language acquisition.
• Acoustic properties and language background interact to shape how non-native vowels are perceived.