Electrophysiological (EEG, sEEG, MEG) evidence for multiple audiovisual interactions in the human auditory cortex

Besle, Julien; Bertrand, Olivier; Giard, Marie‐Hélène

doi:10.1016/j.heares.2009.06.016

Cited by 75 publications

(77 citation statements)

References 69 publications

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“…In addition, because only brain activity earlier than 200 msec can clearly characterize cross‐modal interactions (Besle et al. 2009; Sella et al. 2014), our analysis was limited to the initial 200 msec after consonant onset.…”

Section: Discussionmentioning

confidence: 99%

“…2005) and integration (Besle et al. 2009). Thus, all the brain areas and hemispheres found to be affected by experimental conditions in this study have already been mentioned in relation to some aspects of our audio‐visual task.…”

Section: Discussionmentioning

confidence: 99%

“…Auditory cortex has been reported as the site of early (<200 msec) audio‐visual speech integration (Besle et al. 2009). In addition to its classic role in speech production, Broca's area (left inferior frontal cortex) has been associated with processing inputs that are congruent with pre‐existing heuristics (Tsujii et al.…”

Section: Discussionmentioning

confidence: 99%

“…These findings often related to sensory‐specific Event‐Related Potential (ERP) components such as the auditory P 50 (Talsma and Woldorff 2005) and N 100 (Giard and Peronnet 1999; Besle et al. 2009), the haptic N 140 (Taylor‐Clarke et al. 2002; Forster and Eimer 2005), and the visual P 1 , N 1 (Eimer and Driver 2000) and N 185 (Giard and Peronnet 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Interestingly, electrophysiological studies on early (<200 msec) audio‐visual speech interactions in auditory cortex indicate a probable role of sensory, attentional and task‐related factors in modulating these early interactions (Besle et al. 2009), underscoring the importance of controlling these factors in audio‐visual interaction studies.…”

Section: Introductionmentioning

confidence: 99%

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Spatio‐temporal distribution of brain activity associated with audio‐visually congruent and incongruent speech and the McGurk Effect

2015

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IntroductionSpatio‐temporal distributions of cortical activity to audio‐visual presentations of meaningless vowel‐consonant‐vowels and the effects of audio‐visual congruence/incongruence, with emphasis on the McGurk effect, were studied. The McGurk effect occurs when a clearly audible syllable with one consonant, is presented simultaneously with a visual presentation of a face articulating a syllable with a different consonant and the resulting percept is a syllable with a consonant other than the auditorily presented one.MethodsTwenty subjects listened to pairs of audio‐visually congruent or incongruent utterances and indicated whether pair members were the same or not. Source current densities of event‐related potentials to the first utterance in the pair were estimated and effects of stimulus–response combinations, brain area, hemisphere, and clarity of visual articulation were assessed.ResultsAuditory cortex, superior parietal cortex, and middle temporal cortex were the most consistently involved areas across experimental conditions. Early (<200 msec) processing of the consonant was overall prominent in the left hemisphere, except right hemisphere prominence in superior parietal cortex and secondary visual cortex. Clarity of visual articulation impacted activity in secondary visual cortex and Wernicke's area. McGurk perception was associated with decreased activity in primary and secondary auditory cortices and Wernicke's area before 100 msec, increased activity around 100 msec which decreased again around 180 msec. Activity in Broca's area was unaffected by McGurk perception and was only increased to congruent audio‐visual stimuli 30–70 msec following consonant onset.ConclusionsThe results suggest left hemisphere prominence in the effects of stimulus and response conditions on eight brain areas involved in dynamically distributed parallel processing of audio‐visual integration. Initially (30–70 msec) subcortical contributions to auditory cortex, superior parietal cortex, and middle temporal cortex occur. During 100–140 msec, peristriate visual influences and Wernicke's area join in the processing. Resolution of incongruent audio‐visual inputs is then attempted, and if successful, McGurk perception occurs and cortical activity in left hemisphere further increases between 170 and 260 msec.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%