Ashida H, 2011, "Separate processing of expanding and rotating motion in human MT+" Perception 40 ECVP Abstract Supplement, page 132
Separate processing of expanding and rotating motion in human MT+
We have reported that optical flow patterns of rotation and expansion are separately processed in human MT and MST by using fMRI adaptation (Wall, et al 2008), which is partially inconsistent with macaque electrophysiology. In this study, a simple multi-voxel searchlight method (Kriegeskorte and Bandettini, 2007) was used to assess the generality of the result. fMRI responses were measured (Siemens Trio Tim, 3T) while the participants were shown clockwise rotation (CW) or expansion (EXP) of noisy random dot stimuli. Brain Voyager 2.2 (Brain Innovation, The Netherlands) was used for the analysis. Univariate GLM revealed activation for CW or EXP in putative MT+. The searchlight spotted isolated areas of activation, which distinguish CW and EXP, at around MT+, in three hemispheres from three participants. It showed similar activation in the other hemispheres when the statistical criteria was substantially loosened. The activated areas mostly overlap with the putative MT+, while in some cases they were in the anterior parts where retinotopy was not clear. The results supports our previous results that human MT+ (MT and MST) can distinguish global rotation and expansion, leaving it possibile that MST may be more strongly involved in the processing.
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