Effects of Production Training With Ultrasound Biofeedback on Production and Perception of Second-Language English Tense–Lax Vowel Contrasts.

Purpose: This study investigated the efficacy of ultrasound biofeedback compared to a traditional acoustic input–only method in the second-language (L2) production training of English tense–lax vowel contrasts (/i–ɪ/ and /e–ɛ/). The relationship between the degrees of production and perception learn...

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