Cortical Activities during Transparent Motion Perception: An FMRI-MEG Integration Study
To understand how specific brain areas asso ciated with transparent motion perception, neural activities during subjects performing a transparent motion perception task were measured by functional MRI (fMRI) and magne-toencephalography (MEG). An integrative fMRI-MEG me thod, in which the time-varying dipole moments of activated regions were reconstructed from measured MEGs, was applied to data acquired from both fMRI and MEG experiments. Sets of activated regions were determined by statistically analyzing fMRI data and used as spatial constraints for the integrative fMRI-MEG method. Dynamic recurrent neural activities in multiple cortical areas such as V1/V2, left and right intrapa-rietal sulci (IPS) could be successfully detected, suggesting that these three cortical areas play an important role for transpa rent motion perception. It may also reflect feed-forward and feed-back visual processes among different functional visual areas.
KeywordsTransparent motion MEG fMRI Source estimation Visual perception
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