Abstract
As a bridge spans a chasm and joins two isolated regions, so connections bring unity to fragmented knowledge. Our cerebral cortexes contain large association areas that are functionally wired to connect isolated bits of sensory inputs. These connections allow purposeful response to our environment. For example, seeing a coiled timber rattlesnake beside one's path in the woods and simultaneously hearing her distinctive warning rattle elicit an acute avoidance response from an appropriately programmed and connected brain.