Table 1.

Summary of algorithm to identify borders of visual areas^{^a}

Visual area criteria	Processing steps to impose criteria
(1) Area must have orthogonal retinotopy contours and consistent visual field sign	Thresholding of visual field sign map to create initial area borders (Fig. 1D)
(2) Area must have a nonredundant visual field representation within its borders	Compare “integral” versus “union” of visual coverage. Segment area with watershed if redundant (Fig. 1E)
(3) Adjacent areas with same visual field sign must have overlapping visual coverage	Compute overlap of all adjacent, same sign areas. Fuse adjacent areas if representation is nonoverlapping (Fig. 1F–J)
(4) Area must be at a consistent cortical location across experiments	“Significantly clustered” patches are identified as a visual area (Fig. 3)

↵^aLeft column is the list of four criteria that must be met to identify each patch as a visual area. Right column summarizes the processing steps taken to enforce the corresponding criterion.