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  Reading direct speech quotes increases theta phase-locking: Evidence for cortical tracking of inner speech?

Yao, B., Taylor, J. R., Banks, B., & Kotz, S. A. (2021). Reading direct speech quotes increases theta phase-locking: Evidence for cortical tracking of inner speech? NeuroImage, 239: 118313. doi:10.1016/j.neuroimage.2021.118313.

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 Creators:
Yao, Bo1, Author
Taylor, Jason R.1, Author
Banks, Briony2, Author
Kotz, Sonja A.3, 4, Author           
Affiliations:
1Division of Neuroscience & Experimental Psychology, School of Psychological Sciences, University of Manchester, United Kingdom, ou_persistent22              
2Department of Psychology, Lancaster University, United Kingdom, ou_persistent22              
3Department of Neuropsychology and Psychopharmacology, Maastricht University, the Netherlands, ou_persistent22              
4Department Neuropsychology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634551              

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Free keywords: Inner speech; Neural oscillations; Phase synchrony; Phase-locking; Reading; Theta activity
 Abstract: Growing evidence shows that theta-band (4–7 Hz) activity in the auditory cortex phase-locks to rhythms of overt speech. Does theta activity also encode the rhythmic dynamics of inner speech? Previous research established that silent reading of direct speech quotes (e.g., Mary said: “This dress is lovely!”) elicits more vivid inner speech than indirect speech quotes (e.g., Mary said that the dress was lovely). As we cannot directly track the phase alignment between theta activity and inner speech over time, we used EEG to measure the brain's phase-locked responses to the onset of speech quote reading. We found that direct (vs. indirect) quote reading was associated with increased theta phase synchrony over trials at 250–500 ms post-reading onset, with sources of the evoked activity estimated in the speech processing network. An eye-tracking control experiment confirmed that increased theta phase synchrony in direct quote reading was not driven by eye movement patterns, and more likely reflects synchronous phase resetting at the onset of inner speech. These findings suggest a functional role of theta phase modulation in reading-induced inner speech.

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Language(s): eng - English
 Dates: 2021-05-282021-02-092021-06-242021-06-252021-10-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.neuroimage.2021.118313
PMID: 34175425
Other: epub 2021
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Title: NeuroImage
Source Genre: Journal
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Publ. Info: Orlando, FL : Academic Press
Pages: - Volume / Issue: 239 Sequence Number: 118313 Start / End Page: - Identifier: ISSN: 1053-8119
CoNE: https://pure.mpg.de/cone/journals/resource/954922650166