Effects of age and left hemisphere lesions on audiovisual integration of speech.

Brain Lang

Neurology Department and Center for Brain Plasticity and Recovery, Georgetown University Medical Center, Washington DC, USA; Research Division, MedStar National Rehabilitation Hospital, Washington DC, USA. Electronic address:

Published: July 2020

Neuroimaging studies have implicated left temporal lobe regions in audiovisual integration of speech and inferior parietal regions in temporal binding of incoming signals. However, it remains unclear which regions are necessary for audiovisual integration, especially when the auditory and visual signals are offset in time. Aging also influences integration, but the nature of this influence is unresolved. We used a McGurk task to test audiovisual integration and sensitivity to the timing of audiovisual signals in two older adult groups: left hemisphere stroke survivors and controls. We observed a positive relationship between age and audiovisual speech integration in both groups, and an interaction indicating that lesions reduce sensitivity to timing offsets between signals. Lesion-symptom mapping demonstrated that damage to the left supramarginal gyrus and planum temporale reduces temporal acuity in audiovisual speech perception. This suggests that a process mediated by these structures identifies asynchronous audiovisual signals that should not be integrated.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7379161PMC
http://dx.doi.org/10.1016/j.bandl.2020.104812DOI Listing

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