Synchronization between overt speech envelope and EEG oscillations during imagined speech

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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.

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