THE earliest stages of cortical visual processing in areas V1 and V2 o
f the macaque monkey contain internal subdivisions ('blobs' and 'inter
blobs' in layer 4B in V1; thin, thick and interstripes in V2) that are
selectively interconnected and contain neurons with distinctive visua
l response properties(1-10). Here ae use anatomical pathway tracing to
demonstrate that higher visual areas, V4 and the ventral posterior in
ferotemporal cortex, each contain anatomical subdivisions that have di
stinct input and output projections. These findings, in conjunction wi
th others(11-15), suggest that modularity and multistream processing w
ithin individual cortical areas are widespread features of neocortical
organization.