Abstract
While human speech comprehension is thought to be an active process that involves top-down predictions, it remains unclear how predictive information is used to prepare for the processing of upcoming speech information. We aimed to identify the neural signatures of the preparatory processing of upcoming speech. Participants selectively attended to one of two competing naturalistic, narrative speech streams, and a temporal response function (TRF) method was applied to derive event-related-like neural responses from electroencephalographic data. The phase responses to the attended speech at the delta band (1–4 Hz) were correlated with the comprehension performance of individual participants, with a latency of − 200–0 ms relative to the onset of speech amplitude envelope fluctuations over the fronto-central and left-lateralized parietal electrodes. The phase responses to the attended speech at the alpha band also correlated with comprehension performance but with a latency of 650–980 ms post-onset over the fronto-central electrodes. Distinct neural signatures were found for the attentional modulation, taking the form of TRF-based amplitude responses at a latency of 240–320 ms post-onset over the left-lateralized fronto-central and occipital electrodes. Our findings reveal how the brain gets prepared to process an upcoming speech in a continuous, naturalistic speech context.
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Data availability
Dataset generated in our study has been uploaded to OSF (https://osf.io/87srv/?view_only=13f01e1f1f7b4cf98555ffacd878a53b). We have also provided the experimental materials, including the speech audios and the comprehension questions. The data analysis codes are available upon request.
Abbreviations
- EEG:
-
Electroencephalogram
- ERP:
-
Event-related potential
- IC:
-
Independent component
- TRF:
-
Temporal response function
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NSFC) and the German Research Foundation (DFG) in project Crossmodal Learning (Grant No.: NSFC 62061136001/DFG TRR-169/C1, B1), the National Natural Science Foundation of China (grant number: 61977041 and U1736220), and Tsinghua University Initiative Scientific Research Program (Grant No.: 20197010006). The authors would like to thank Prof. Dr. Xiaoqin Wang and Dr. Yue Ding for providing the shielded room for the experiment as well as necessary technical support.
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J.L. drafted the paper, conducted the experiment and data analysis; D.Z. designed the experiment and drafted the paper; B.H., G.D., and A.K.E. edited the manuscript.
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Li, J., Hong, B., Nolte, G. et al. Preparatory delta phase response is correlated with naturalistic speech comprehension performance. Cogn Neurodyn 16, 337–352 (2022). https://doi.org/10.1007/s11571-021-09711-z
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DOI: https://doi.org/10.1007/s11571-021-09711-z