Diagnostic and statistical manual of mental disorders: DSM–5. Learning to match auditory and visual speech cues: Social influences on acquisition of phonological categories.
A measure for assessing the effects of audiovisual speech integration. The present study implicated that the correlation between audiovisual speech perception and temporal processing might be contingent on the range of individual temporal processing abilities.Īltieri, N., Townsend, J. No such correlation was found in children with ASD either when the visual led the audio or when the audio led the visual. The correlation analysis revealed that audiovisual speech perception and temporal processing were correlated in TD children when the visual led the audio but not when the audio led the visual. We found that children with ASD showed weaker audiovisual speech perception (based on the population) and less acute temporal processing compared with TD children. On the basis of the data from participants who participated in both Experiment 1 and Experiment 2 (20 children with ASD, 21 TD children), we analyzed the correlation between audiovisual speech perception and temporal processing in children with ASD and TD children separately. We recruited 4- to 8-year-old children, some with ASD and some TD, to perform a McGurk task in Experiment 1 (24 children with ASD, 26 TD children) and to complete a simultaneity judgement task in Experiment 2 (31 children with ASD, 29 TD children). To this end, using the McGurk paradigm, we implemented two experiments to explore audiovisual speech perception (Experiment 1) and temporal processing (Experiment 2), as well as the correlation between them, in children with ASD and typically developing (TD) children. The current study has examined the relationship between the audiovisual speech perception deficits and temporal processing deficits in children with and without ASD. This finding suggests that superior temporal cortex prefers when auditory and visual input support the same representation.Children with autism spectrum disorder (ASD) have deficits in audiovisual speech perception and temporal processing.
We found larger activity for congruent audiovisual stimuli than for incongruent (McGurk) stimuli in bilateral superior temporal cortex, extending into the primary auditory cortex. This enabled us to compare the neuronal responses during congruent audiovisual stimulation with incongruent audiovisual stimulation leading to the McGurk illusion while avoiding the possible confounding factor of sensory surprise that can occur when McGurk stimuli are only occasionally perceived. Here, we used fMRI to look at the neural responses of human participants during the McGurk illusion-in which auditory /aba/ and visual /aga/ inputs are fused to perceived /ada/-in a large homogenous sample of participants who consistently experienced this illusion. However, the direction of this congruency effect (i.e., stronger or weaker activity for congruent compared to incongruent stimulation) has been more equivocal. This area was previously found to be sensitive to audiovisual congruency. The superior temporal cortex is an important combining site for this integration process. Auditory speech perception can be altered by concurrent visual information.
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