期刊
NEUROIMAGE
卷 227, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2020.117586
关键词
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资金
- NIMH [MH114166-01]
- ERC Advanced grant [787836, 742141]
- European Research Council (ERC) [742141, 787836] Funding Source: European Research Council (ERC)
Acquiring a new language involves learning linguistic attributes on multiple levels simultaneously, with proficiency significantly influencing the neural encoding of language. Higher proficiency in nonnative listeners leads to a neural encoding more similar to that of native listeners, facilitating accurate decoding of language proficiency.
Acquiring a new language requires individuals to simultaneously and gradually learn linguistic attributes on multiple levels. Here, we investigated how this learning process changes the neural encoding of natural speech by assessing the encoding of the linguistic feature hierarchy in second-language listeners. Electroencephalography (EEG) signals were recorded from native Mandarin speakers with varied English proficiency and from native English speakers while they listened to audio-stories in English. We measured the temporal response functions (TRFs) for acoustic, phonemic, phonotactic, and semantic features in individual participants and found a main effect of proficiency on linguistic encoding. This effect of second-language proficiency was particularly prominent on the neural encoding of phonemes, showing stronger encoding of new phonemic contrasts (i.e., English contrasts that do not exist in Mandarin) with increasing proficiency. Overall, we found that the nonnative listeners with higher proficiency levels had a linguistic feature representation more similar to that of native listeners, which enabled the accurate decoding of language proficiency. This result advances our understanding of the cortical processing of linguistic information in second-language learners and provides an objective measure of language proficiency.
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