Cluster plots of ipsilateral vs. contralateral response of 2 subjects. For each cluster plot, values of individual pixels are plotted as a function of the response measured at that pixel to the ipsilateral stimulus (horizontal axis) vs. the response measured at that locus evoked by the contralateral stimulus (vertical axis). Colors depict the pixels that maximally responded to ipsilateral (green) and contralateral (red) stimulation. Cluster separation follows the same trend as the time course shown in Figure 4. After 5 seconds, the activity of the responding population has diverged into two distinct clusters. Reference images at top are at same orientation as the reference images in Figure 1.