scholarly journals Contributions of local speech encoding and functional connectivity to audio-visual speech perception

eLife ◽  
2017 ◽  
Vol 6 ◽  
Author(s):  
Bruno L Giordano ◽  
Robin A A Ince ◽  
Joachim Gross ◽  
Philippe G Schyns ◽  
Stefano Panzeri ◽  
...  
Keyword(s):  
Functional Connectivity ◽  
Frontal Cortex ◽  
Speech Intelligibility ◽  
Brain Activity ◽  
Visual Speech ◽  
Speech Comprehension ◽  
Low Snr ◽  
Speech Encoding ◽  
Inferior Frontal Cortex ◽  
Underlying Network

Seeing a speaker’s face enhances speech intelligibility in adverse environments. We investigated the underlying network mechanisms by quantifying local speech representations and directed connectivity in MEG data obtained while human participants listened to speech of varying acoustic SNR and visual context. During high acoustic SNR speech encoding by temporally entrained brain activity was strong in temporal and inferior frontal cortex, while during low SNR strong entrainment emerged in premotor and superior frontal cortex. These changes in local encoding were accompanied by changes in directed connectivity along the ventral stream and the auditory-premotor axis. Importantly, the behavioral benefit arising from seeing the speaker’s face was not predicted by changes in local encoding but rather by enhanced functional connectivity between temporal and inferior frontal cortex. Our results demonstrate a role of auditory-frontal interactions in visual speech representations and suggest that functional connectivity along the ventral pathway facilitates speech comprehension in multisensory environments.

scholarly journals Contributions of local speech encoding and functional connectivity to audio-visual speech integration

2016 ◽  
Author(s):  
Bruno L. Giordano ◽  
Robin A. A. Ince ◽  
Joachim Gross ◽  
Stefano Panzeri ◽  
Philippe G. Schyns ◽  
...  
Keyword(s):  
Functional Connectivity ◽  
Frontal Cortex ◽  
Speech Intelligibility ◽  
Brain Activity ◽  
Visual Speech ◽  
Speech Comprehension ◽  
Low Snr ◽  
Speech Encoding ◽  
Inferior Frontal Cortex ◽  
Underlying Network

AbstractSeeing a speaker’s face enhances speech intelligibility in adverse environments. We investigated the underlying network mechanisms by quantifying local speech representations and directed connectivity in MEG data obtained while human participants listened to speech of varying acoustic SNR and visual context. During high acoustic SNR speech encoding by entrained brain activity was strong in temporal and inferior frontal cortex, while during low SNR strong entrainment emerged in premotor and superior frontal cortex. These changes in local encoding were accompanied by changes in directed connectivity along the ventral stream and the auditory-premotor axis. Importantly, the behavioural benefit arising from seeing the speaker's face was not predicted by changes in local encoding but rather by enhanced functional connectivity between temporal and inferior frontal cortex. Our results demonstrate a role of auditory-motor interactions in visual speech representations and suggest that functional connectivity along the ventral pathway facilitates speech comprehension in multisensory environments.

Activity and functional connectivity of inferior frontal cortex associated with response conflict

2005 ◽  
Vol 24 (2) ◽  
pp. 335-342 ◽  
Author(s):  
Nobuko Kemmotsu ◽  
Michele E. Villalobos ◽  
Michael S. Gaffrey ◽  
Eric Courchesne ◽  
Ralph-Axel Müller
Keyword(s):  
Functional Connectivity ◽  
Frontal Cortex ◽  
Response Conflict ◽  
Inferior Frontal Cortex

scholarly journals Lip movements entrain the observers’ low-frequency brain oscillations to facilitate speech intelligibility

eLife ◽  
2016 ◽  
Vol 5 ◽  
Author(s):  
Hyojin Park ◽  
Christoph Kayser ◽  
Gregor Thut ◽  
Joachim Gross
Keyword(s):  
Visual Cortex ◽  
Speech Processing ◽  
Speech Intelligibility ◽  
Brain Activity ◽  
Low Frequency ◽  
Visual Speech ◽  
Visual Signals ◽  
Partial Coherence ◽  
Auditory Speech ◽  
Oscillatory Brain Activity

During continuous speech, lip movements provide visual temporal signals that facilitate speech processing. Here, using MEG we directly investigated how these visual signals interact with rhythmic brain activity in participants listening to and seeing the speaker. First, we investigated coherence between oscillatory brain activity and speaker’s lip movements and demonstrated significant entrainment in visual cortex. We then used partial coherence to remove contributions of the coherent auditory speech signal from the lip-brain coherence. Comparing this synchronization between different attention conditions revealed that attending visual speech enhances the coherence between activity in visual cortex and the speaker’s lips. Further, we identified a significant partial coherence between left motor cortex and lip movements and this partial coherence directly predicted comprehension accuracy. Our results emphasize the importance of visually entrained and attention-modulated rhythmic brain activity for the enhancement of audiovisual speech processing.

scholarly journals Author response: Contributions of local speech encoding and functional connectivity to audio-visual speech perception

2017 ◽  
Author(s):  
Bruno L Giordano ◽  
Robin A A Ince ◽  
Joachim Gross ◽  
Philippe G Schyns ◽  
Stefano Panzeri ◽  
...  
Keyword(s):  
Speech Perception ◽  
Functional Connectivity ◽  
Visual Speech ◽  
Author Response ◽  
Speech Encoding ◽  
Visual Speech Perception

scholarly journals Functional connectivity changes associated with fMRI neurofeedback of right inferior frontal cortex in adolescents with ADHD

NeuroImage ◽  
2019 ◽  
Vol 188 ◽  
pp. 43-58 ◽  
Author(s):  
K. Rubia ◽  
M. Criaud ◽  
M. Wulff ◽  
A. Alegria ◽  
H. Brinson ◽  
...  
Keyword(s):  
Functional Connectivity ◽  
Frontal Cortex ◽  
Inferior Frontal Cortex

scholarly journals Modulating the left inferior frontal cortex by task domain, cognitive challenge and tDCS

2021 ◽  
Author(s):  
Davide Nardo ◽  
Katerina Pappa ◽  
John Duncan ◽  
Peter Zeidman ◽  
Martina F. Callaghan ◽  
...  
Keyword(s):  
Frontal Cortex ◽  
Language Processing ◽  
Functional Neuroimaging ◽  
Brain Activity ◽  
Spoken Language ◽  
Spoken Language Processing ◽  
Domain Specific ◽  
Inferior Frontal Cortex ◽  
Domain Generality ◽  
Cognitive Challenge

ABSTRACTThe left inferior frontal cortex (LIFC) is a key region for spoken language processing, but its neurocognitive architecture remains controversial. Here we assess the domain-generality vs. domain-specificity of the LIFC from behavioural, functional neuroimaging and neuromodulation data. Using concurrent fMRI and transcranial direct current stimulation (tDCS) delivered to the LIFC, we investigated how brain activity and behavioural performance are modulated by task domain (naming vs. non-naming), cognitive challenge (low vs. high), and tDCS (anodal vs. sham). The data revealed: (1) co-existence of neural signatures both common and distinct across tasks within the LIFC; (2) domain-preferential effects of task (naming); (3) significant tDCS modulations of activity in a LIFC sub-region selectively during high-challenge naming. The presence of both domain-specific and domain-general signals, and the existence of a gradient of activation where naming relied more on sub-regions within the LIFC, may help reconcile both perspectives on spoken language processing.

scholarly journals Reduced functional connectivity between V1 and inferior frontal cortex associated with visuomotor performance in autism

NeuroImage ◽  
2005 ◽  
Vol 25 (3) ◽  
pp. 916-925 ◽  
Author(s):  
Michele E. Villalobos ◽  
Akiko Mizuno ◽  
Branelle C. Dahl ◽  
Nobuko Kemmotsu ◽  
Ralph-Axel Müller
Keyword(s):  
Functional Connectivity ◽  
Frontal Cortex ◽  
Inferior Frontal Cortex ◽  
Visuomotor Performance
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