Audio-visual integration through the parallel visual pathways

作者：Kaposvari Peter; Csete Gergo; Bognar Anna; Csibri Peter; Toth Eszter; Szabo Nikoletta; Vecsei Laszlo; Sary Gyula^*; Kincses Zsigmond Tamas

来源：Brain Research, 2015, 1624: 71-77.

DOI：10.1016/j.brainres.2015.06.036

• MRI
• DTI
• TBSS
• Multisensory
• Doubleflash

Audio-visual integration has been shown to be present in a wide range of different conditions, some of which are processed through the dorsal, and others through the ventral visual pathway. Whereas neuroimaging studies have revealed integration-related activity in the brain, there has been no imaging study of the possible role of segregated visual streams in audio-visual integration.
We set out to determine how the different visual pathways participate in this communication. We investigated how audio-visual integration can be supported through the dorsal and ventral visual pathways during the double flash illusion. Low-contrast and chromatic isoluminant stimuli were used to drive preferably the dorsal and ventral pathways, respectively. In order to identify the anatomical substrates of the audio-visual interaction in the two conditions, the psychophysical results were correlated with the white matter integrity as measured by diffusion tensor imaging. The psychophysiological data revealed a robust double flash illusion in both conditions. A correlation between the psychophysical results and local fractional anisotropy was found in the occipito-parietal white matter in the low-contrast condition, while a similar correlation was found in the infero-temporal white matter in the chromatic isoluminant condition. Our results indicate that both of the parallel visual pathways may play a role in the audio-visual interaction.

• 出版日期2015-10-22