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ISSN : 1226-9654

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Vol.20 No.4
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The influence of visual mouth cue on auditory speech perception: Structural Equation modeling

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
2008, v.20 no.4, pp.223-246
https://doi.org/10.22172/cogbio.2008.20.4.002



& (2008). The influence of visual mouth cue on auditory speech perception: Structural Equation modeling. The Korean Journal of Cognitive and Biological Psychology, 20(4), 223-246, https://doi.org/10.22172/cogbio.2008.20.4.002
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Abstract

Visual cues emitted from a speaker, such as mouth and lip movements, are critical aspects of sensory information that influence auditory speech perception in face to face conversation. The way in which these complex visual cues are processed remains to be elucidated. Here we apply fMRI to a cross-modal speech perception paradigm in order to determine how functional connectivity between brain areas changes depending on the type of visual cue. Data obtained from a previous fMRI study in which three conditions, closed mouth (CM), twitching mouth (TM), or speaking mouth (SM) were delivered during an auditory sentence perception task. Structural Equation Modeling (SEM) was used to estimate functional strengths of links in a network among the brain regions activated in these three conditions. The chosen brain areas, which were modeled only in the right hemisphere, consisted of visual areas (lingual gyrus and V5/MT), both anterior and posterior superior temporal sulci (aSTS and pSTS), and the area equivalent to left Broca’s area (rBroca’s). Significant differences were found for the functional linkages between V5/MT and rBroca’s area across the three conditions. The path from V5/MT to rBroca became positive both during the TM and SM conditions, whereas that in the CM condition was negative. However, the connection from rBroca to V5/MT became negative both during the TM and SM, whereas that in the CM condition was positive. Additional linguistic information, such as the mouth movements of the SM condition, resulted in increased statistical significance of these linkages relative to the TM condition. The dynamic changes in functional connectivity between V5/MT and Broca’s area in the right hemisphere may subserve the cross-modal processing of auditory speech by inhibiting irrelevant or interfering visual cues from mouth movement.

keywords
교차양상 처리, 구조방정식 모형 (SEM), 입술 읽기, 언어, fMRI, Cross-modal processing, Structural Equation Model (SEM), lip-reading, speech, fMRI

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