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CORTICAL PHASE SYNCHRONISATION MEDIATES NATURAL FACE-SPEECH PERCEPTION
Linköpings universitet, Institutionen för datavetenskap.
2015 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
Abstract [en]

It is a challenging task for researchers to determine how the brain solves multisensory perception, and the neural mechanisms involved remain subject to theoretical conjecture.  According to a hypothesised cortical model for natural audiovisual stimulation, phase synchronised communications between participating brain regions play a mechanistic role in natural audiovisual perception.  The purpose of this study was to test the hypothesis by investigating oscillatory dynamics from ongoing EEG recordings whilst participants passively viewed ecologically realistic face-speech interactions in film.  Lagged-phase synchronisation measures were computed for conditions of eye-closed rest (REST), speech-only (auditory-only, A), face-only (visual-only, V) and face-speech (audio-visual, AV) stimulation. Statistical contrasts examined AV > REST, AV > A, AV > V and AV-REST > sum(A,V)-REST effects.  Results indicated that cross-communications between the frontal lobes, intraparietal associative areas and primary auditory and occipital cortices are specifically enhanced during natural face-speech perception and that phase synchronisation mediates the functional exchange of information associated with face-speech processing between both sensory and associative regions in both hemispheres.  Furthermore, phase synchronisation between cortical regions was modulated in parallel within multiple frequency bands.  

sted, utgiver, år, opplag, sider
2015. , s. 44
Emneord [en]
EEG, Phase, Synchronisation, Coherence, Multisensory, Face, Speech, Processing, LORETA, Audiovisual, Perception, Oscillations, Neural
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-122825ISRN: LIU-IDA/KOGVET-A--15/014--SEOAI: oai:DiVA.org:liu-122825DiVA, id: diva2:874117
Fag / kurs
Cognitive science
Presentation
2015-06-02, Grace Hopper, Linköping University, Linköping, 13:45 (engelsk)
Veileder
Examiner
Tilgjengelig fra: 2015-11-30 Laget: 2015-11-25 Sist oppdatert: 2018-01-10bibliografisk kontrollert

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