300-400 distinct areas in cortex which specialize. The blind from birth-youth use this area when brailling. A stroke which ends facial recognition must occur in the temporal lobe and destroy a postage stamp-sized spot.
Blindness can result from atrophe of the optic nerve.
An acute sense of touch may require more brain space. Synesthesia is the taste of visual patterns. It is in the limbic rather than the cortex, and it may take the form of tasting colored odors, sensing colored voices, or hearing colored symphonies. Cannaboloid binding sites are dense in fly brains and in other creatures.