کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4035752 | 1263547 | 2007 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The role of cortical area V5/MT+ in speed-tuned directional anisotropies in global motion perception The role of cortical area V5/MT+ in speed-tuned directional anisotropies in global motion perception](/preview/png/4035752.png)
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.
Journal: Vision Research - Volume 47, Issue 7, March 2007, Pages 887–898