So far visual processing has been mostly linear. There are feedback (the LGN gets information from elsewhere on the cortex, for example) and crossovers, but mostly the coarse and fine visual pathways have been processed separately and there's been a reasonably steady progression from the eye to the primary visual cortex.
From V3, visual information is sent to dozens of areas all over the cortex. These modules send information to one another and draw from and feed other areas. It stops being a production line and turns into a big construction site, with many areas extracting and associating different features, all simultaneously.
Mind Hacks by Tom Stafford
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