Supplementary Figure 1.

Mean signal changes and SSIs obtained with the two fixation tasks. Mean signal changes for each area and each of the four stimulus conditions were averaged across subjects in the version of the fixation task that required subjects to count target letters (a) and in the version that required them to respond with a button press (b). Conventions are the same as in Figures 3 and 4. (c-d) Sensory suppression indexes (SSIs) were derived from the data shown in (a) and (b), respectively. Vertical bars indicate S.E.M.