Figure 10. Effect of attention on the spatiotopy of MT.

Scatter plot of spatiotopy indexes during the attention condition against passive fixation condition of all voxels of MT of the three subjects. An index of +1 implies that the area is perfectly retinotopic and an index of −1 implies that it is perfectly spatiotopic. The light blue open circles show the mean value of the spatiotopic index across voxels. The red and green stars are the indexes calculated on the averaged BOLD responses of all voxels in MT of the left (red) and right (green) hemisphere. The majority of voxels cluster in the upper left quadrant, spatiotopic in passive fixation and retinotopic with attention to fovea. In all three cases, the effect of attention was highly significant: paired t-tests in all conditions yielded p<0.0001.