This study examines the production and perception of the three Basque sibilant fricatives by L1 English learners in a semester-long university course. Basque has three sibilant fricatives: lamino-alveolar (/s̻/), apico-alveolar (/s̺/), and pre-palatal (/ʃ/) sounds. Acoustically, the first two sounds share similarities with English /s/ and /ʃ/, respectively. L2 phonology theories posit that learners will map the production and perception of L2 sounds to (similar) sounds in their native language. Afterwards, they will create new categories based on the phonetic proximity of the new sounds and those in their native language. Ten students enrolled in a Beginners’ Basque course and two native speakers of Basque serving as control group undertook a read-aloud task (Experiment 1) followed by an ABX discrimination task (Experiment 2) during Week 5 of classes. Center of Gravity and accuracy scores were extracted. Results show that learners tended to merge the two apical sibilants into an English /s/-like sound. Accuracy scores between the two alveolar sibilants in Basque were significantly lower than the other sound contrasts.
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