| Literature DB >> 17306855 |
Deborah Giaschi1, Amy Zwicker, Simon Au Young, Bruce Bjornson.
Abstract
Several different directional anisotropies have been found in global motion perception. The purpose of this study was to examine the role of the motion sensitive cortical area V5/MT+ in directional anisotropies for translational flow fields. Experiments 1 and 2 tested direction discrimination and detection of moving random dot patterns. When the speed of motion was 8 deg/s, lower coherence thresholds were found for centripetal relative to centrifugal hemifield motion. When the speed of motion was 1 deg/s, coherence thresholds were similar in all directions. Experiment 3 used fMRI to measure the BOLD response to different directions of motion at speeds of 1 and 8 deg/s. Greater activity was found in V5/MT+ for centripetal motion than for centrifugal motion at both speeds. These results suggest that V5/MT+ does play a role in directional motion anisotropies. This role is discussed with respect to visually-guided reaching and locomotion.Mesh：
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Year: 2007 PMID： 17306855 DOI： 10.1016/j.visres.2006.12.017
Source DB: PubMed Journal: Vision Res ISSN： 0042-6989 Impact factor: 1.886