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Synchronization between overt speech envelope and EEG oscillations during imagined speech

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dc.contributor.author Watanabe, Hiroki en
dc.contributor.author Tanaka, Hiroki en
dc.contributor.author Sakriani, Sakti en
dc.contributor.author Nakamura, Satoshi en
dc.date.accessioned 2020-06-03T00:07:02Z
dc.date.available 2020-06-03T00:07:02Z
dc.date.issued 2019-04-18
dc.identifier.uri http://hdl.handle.net/10061/13988
dc.description.abstract Neural oscillations synchronize with the periodicity of external stimuli such as the rhythm of the speechamplitude envelope. This synchronization induces a speech-specific, replicable neural phase patternacross trials and enables perceived speech to be classified. In this study, we hypothesized that neuraloscillations during articulatory imagination of speech could also synchronize with the rhythm of speechimagery. To validate the hypothesis, after replacing the imagined speech with overt speech due to thephysically unobservable nature of imagined speech, we investigated (1) whether the EEG-based regressedspeech envelopes correlate with the overt speech envelope and (2) whether EEG during the imaginedspeech can classify speech stimuli with different envelopes. The variability of the duration of the imag-ined speech across trials was corrected using dynamic time warping. The classification was based on thedistance between a test data and a template waveform of each class. Results showed a significant correla-tion between the EEG-based regressed envelope and the overt speech envelope. The average classificationaccuracy was 38.5%, which is significantly above the rate of chance (33.3%). These results demonstratethe synchronization between EEG during the imagined speech and the envelope of the overt counterpart. en
dc.language.iso en
dc.publisher Elsevier
dc.rights 2019 Elsevier B.V. and Japan Neuroscience Society. All rights reserved. en
dc.subject Phase synchronization en
dc.subject EEG en
dc.subject Imagined speech en
dc.subject Neural oscillations en
dc.subject Speech envelope en
dc.title Synchronization between overt speech envelope and EEG oscillations during imagined speech en
dc.type.nii Journal Article
dc.contributor.transcription ワタナベ, ヒロキ ja_Kana
dc.contributor.transcription タナカ, ヒロキ ja_Kana
dc.contributor.transcription ナカムラ, サトシ ja_Kana
dc.contributor.alternative 渡部, 宏樹 ja
dc.contributor.alternative 田中, 宏季 ja
dc.contributor.alternative 中村, 哲 ja
dc.textversion author
dc.identifier.jtitle Neuroscience Research en
dc.identifier.volume 153
dc.identifier.spage 48
dc.identifier.epage 55
dc.relation.doi 10.1016/j.neures.2019.04.004
dc.identifier.NAIST-ID 85620508
dc.identifier.NAIST-ID 82042235
dc.identifier.NAIST-ID 73297715
dc.identifier.NAIST-ID 73296626

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