May 16, 2008

Temporal characteristics of audiovisual information processing

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
Galit Fuhrmann AlpertRobert T Knight


In complex natural environments, auditory and visual information often have to be processed simultaneously. Previous functional magnetic resonance imaging (fMRI) studies focused on the spatial localization of brain areas involved in audiovisual (AV) information processing, but the temporal characteristics of AV information flow in these regions remained unclear. In this study, we used fMRI and a novel information-theoretic approach to study the flow of AV sensory information. Subjects passively perceived sounds and images of objects presented either alone or simultaneously. Applying the measure of mutual information, we computed for each voxel the latency in which the blood oxygenation level-dependent signal had the highest information content about the preceding stimulus. The results indicate that, after AV stimulation, the earliest informative activity occurs in right Heschl's gyrus, left primary visual cortex, and the posterior portion of the superior temporal gyrus, which is known as a region involved in object-related AV integration. Informative activity in the anterior portion of superior temporal gyrus, middle temporal gyrus, right occipital cortex, and inferior frontal cortex was found at a later latency. Moreover, AV p...Continue Reading

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  • Citations27


Mentioned in this Paper

Establishment and Maintenance of Localization
Optic Tract Structure
Alveolar Ventilation Function
Adrenal Cortex Diseases
Left Brodmann Area 17
Occipital Lobe
Reaction Time
Visual Perception
Cell Respiration

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