MULTIPLE PROCESSING STREAMS IN OCCIPITOTEMPORAL VISUAL-CORTEX

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.