Characterizing auditory and visual motion processing and integration in hMT+/V5 with ultra-high-field fMRI (7T): very preliminary results.

Barilari, Marco;Gau, Remi;Huber, Renzo;Collignon, Olivier
(2021) Neurocog — Location: Louvain-La-Neuve (23.November.2021)

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The ability of the brain to integrate motion information originating from separate sensory modalities is fundamental to efficiently interact with our dynamic environment. The human occipito-temporal region hMT+/V5 is known to be highly specialized to process visual motion directions. In addition to its role in processing the dominant visual information, it was recently suggested that this region may also engage in crossmodal motion processing from the auditory modality. How multisensory information is represented in this region remains however poorly understood. To further investigate the multisensory nature of hMT+/V5, we characterized single- subject activity with ultra-high field (UHF) fMRI using a visual motion stimulation together with highly ecological directional motion sounds recorded with in-ear microphones from horizontal and vertical speaker arrays. Moreover, we outlined the crossmodal input profile in functionally mapped subregions MT and MST. Our preliminary results confirmed that in addition to a robust selectivity for visual motion, portion of hMT+/V5 selectively responds to moving sounds. We are now further characterizing the brain activity in the cortical depths using UHF fMRI combined with vascular space occupancy (VASO) recording at high spatial resolution (.75mm isotropic). We hypothesize that hMT+/V5 might encode auditory and visual motion information in separate cortical layers, reflecting the feed-forward versus feed-back nature of how sensory information flows into those regions. This project will shed new lights on how crossmodal information is represented across the depth of the cortical layers of motion selective human brain areas.
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Barilari, M., Gau, R., Huber, R., & Collignon, O. (2021). Characterizing auditory and visual motion processing and integration in hMT+/V5 with ultra-high-field fMRI (7T): very preliminary results. Neurocog, Louvain-La-Neuve. https://hdl.handle.net/2078.5/104049