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Abstract #2985

Using wholebrain, high temporal resolution, 3D-EPI-CAIPI to observe multisensory interaction in primary sensory cortices

Wietske van der zwaag 1 , Mayur Narsude 1 , Roberto Martuzzi 2 , and Jos P Marques 3

1 CIBM, EPFL, Lausanne, Switzerland, 2 LNCO, EPFL, Lausanne, Switzerland, 3 UNIL, Lausanne, Switzerland

This study aimed to demonstrate that with a fast BOLD sensitive fMRI acquisition, 3D-EPI-CAIPI with TR=400ms, subtle temporal effects, such as those involved in multisensory facilitation in the primary sensory cortices, can successfully be investigated. Differences in time-to-peak for the BOLD responses mono- or multisensory stimulation could be shown in auditory, visual and motor cortices, with audiovisual stimulation always leading to a faster response than auditory-only or visual-only stimuli. No such effect could be demonstrated for the same stimulus paradigm in otherwise comparable TR=2s data.

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