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Oscillatory dynamics underlying noun and verb production in highly proficient bilinguals
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In: Sci Rep (2022)
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Impaired neural response to speech edges in dyslexia
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In: ISSN: 0010-9452 ; Cortex ; https://hal.archives-ouvertes.fr/hal-03493371 ; Cortex, Elsevier, 2021, 135, pp.207 - 218. ⟨10.1016/j.cortex.2020.09.033⟩ (2021)
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Tracking hierarchical processes in minimal linguistic phrases ...
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Reading-Related Brain Changes in Audiovisual Processing: Cross-Sectional and Longitudinal MEG Evidence
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In: J Neurosci (2021)
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The influence of amount of exposure on bilingual language development: a longitudinal study of Basque-Spanish preschoolers. ...
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The role of lexical information in oscillatory tracking of syntactic structure ...
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Development of neural oscillatory activity in response to speech in children from 4 to 6 years old
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In: Dev Sci (2020)
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Lip-Reading Enables the Brain to Synthesize Auditory Features of Unknown Silent Speech
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In: J Neurosci (2020)
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Abstract:
Lip-reading is crucial for understanding speech in challenging conditions. But how the brain extracts meaning from, silent, visual speech is still under debate. Lip-reading in silence activates the auditory cortices, but it is not known whether such activation reflects immediate synthesis of the corresponding auditory stimulus or imagery of unrelated sounds. To disentangle these possibilities, we used magnetoencephalography to evaluate how cortical activity in 28 healthy adult humans (17 females) entrained to the auditory speech envelope and lip movements (mouth opening) when listening to a spoken story without visual input (audio-only), and when seeing a silent video of a speaker articulating another story (video-only). In video-only, auditory cortical activity entrained to the absent auditory signal at frequencies <1 Hz more than to the seen lip movements. This entrainment process was characterized by an auditory-speech-to-brain delay of ∼70 ms in the left hemisphere, compared with ∼20 ms in audio-only. Entrainment to mouth opening was found in the right angular gyrus at <1 Hz, and in early visual cortices at 1–8 Hz. These findings demonstrate that the brain can use a silent lip-read signal to synthesize a coarse-grained auditory speech representation in early auditory cortices. Our data indicate the following underlying oscillatory mechanism: seeing lip movements first modulates neuronal activity in early visual cortices at frequencies that match articulatory lip movements; the right angular gyrus then extracts slower features of lip movements, mapping them onto the corresponding speech sound features; this information is fed to auditory cortices, most likely facilitating speech parsing. SIGNIFICANCE STATEMENT Lip-reading consists in decoding speech based on visual information derived from observation of a speaker's articulatory facial gestures. Lip-reading is known to improve auditory speech understanding, especially when speech is degraded. Interestingly, lip-reading in silence still activates the auditory cortices, even when participants do not know what the absent auditory signal should be. However, it was uncertain what such activation reflected. Here, using magnetoencephalographic recordings, we demonstrate that it reflects fast synthesis of the auditory stimulus rather than mental imagery of unrelated, speech or non-speech, sounds. Our results also shed light on the oscillatory dynamics underlying lip-reading.
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Keyword:
Research Articles
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URL: http://www.ncbi.nlm.nih.gov/pubmed/31889007
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6989012/
https://doi.org/10.1523/JNEUROSCI.1101-19.2019
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Any leftovers from a discarded prediction? Evidence from eye-movements during sentence comprehension ...
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Any leftovers from a discarded prediction? Evidence from eye-movements during sentence comprehension ...
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I’m Doing Better on My Own: Social Inhibition in Vocabulary Learning in Adults
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Phase−amplitude coupling between theta and gamma oscillations adapts to speech rate
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When the end matters: influence of gender cues during agreement computation in bilinguals ...
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When the end matters: influence of gender cues during agreement computation in bilinguals ...
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When “He” can also be “She”: an ERP study of reflexive pronoun resolution in written mandarin Chinese
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Item parameters dissociate between expectation formats: a regression analysis of time-frequency decomposed EEG data
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Long-range neural synchronization supports fast and efficient reading: EEG correlates of processing expected words in sentences
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