NDLI: Brain networks engaged in audiovisual integration during speech perception revealed by persistent homology-based network filtration.

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Brain networks engaged in audiovisual integration during speech perception revealed by persistent homology-based network filtration.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kim, Heejung Hahm, Jarang Lee, Hyekyoung Kang, Eunjoo Kang, Hyejin Lee, Dong Soo
Description	Author Affiliation: Kim H ( 1 Department of Nuclear Medicine, College of Medicine, Seoul National University , Seoul, Korea.)
Abstract	The human brain naturally integrates audiovisual information to improve speech perception. However, in noisy environments, understanding speech is difficult and may require much effort. Although the brain network is supposed to be engaged in speech perception, it is unclear how speech-related brain regions are connected during natural bimodal audiovisual or unimodal speech perception with counterpart irrelevant noise. To investigate the topological changes of speech-related brain networks at all possible thresholds, we used a persistent homological framework through hierarchical clustering, such as single linkage distance, to analyze the connected component of the functional network during speech perception using functional magnetic resonance imaging. For speech perception, bimodal (audio-visual speech cue) or unimodal speech cues with counterpart irrelevant noise (auditory white-noise or visual gum-chewing) were delivered to 15 subjects. In terms of positive relationship, similar connected components were observed in bimodal and unimodal speech conditions during filtration. However, during speech perception by congruent audiovisual stimuli, the tighter couplings of left anterior temporal gyrus-anterior insula component and right premotor-visual components were observed than auditory or visual speech cue conditions, respectively. Interestingly, visual speech is perceived under white noise by tight negative coupling in the left inferior frontal region-right anterior cingulate, left anterior insula, and bilateral visual regions, including right middle temporal gyrus, right fusiform components. In conclusion, the speech brain network is tightly positively or negatively connected, and can reflect efficient or effortful processes during natural audiovisual integration or lip-reading, respectively, in speech perception.
File Format	HTM / HTML
ISSN	21580014
e-ISSN	21580022
DOI	10.1089/brain.2013.0218
Journal	Brain Connectivity
Issue Number	4
Volume Number	5
Language	English
Publisher	Mary Ann Liebert, Inc.
Publisher Date	2015-05-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Neurology Discipline Brain Brain Physiology Nerve Net Speech Perception Acoustic Stimulation Magnetic Resonance Imaging Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Neuroscience

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