Fig. S3.

BOLD signal strength at each recording point in the average data across all object size and numerosity stimulus conditions, rendered on inflated cortical surfaces showing the same views as used in all other figures and supporting figures. Large draining veins on the pial surface and the superior sagittal sinus and its branches can be seen as areas of low signal strength. These are outlined with dashed lines, which correspond to the red dashed lines seen in other renderings of the cortical surface. Data from these areas are distorted, and the blood flow and oxygenation here result from neural activity elsewhere. Based on a subject-specific threshold of minimum signal strength in the average data, such recording points are excluded from analysis of preferred number and tuning width. The lines highlighting these areas are for illustration only. AU, arbitrary units.