We also found that viewing conditions profoundly affected A.H.'s visual perception of an object's location. She was extremely impaired in placing objects that were stationary and that remained in view for some time. These findings suggest that the brain contains at least two separate visual pathways that code the locations of objects. These conclusions fit well with other types of research pointing to multiple visual pathways. A.H.'s deficit also brings home a more general point.
Vision carries with it a sense of immediacy, of direct contact with the external world.
A.H.'s perceptual errors demonstrate dramatically, however, that vision does not put us in direct contact with the outside world. When we look around, the objects of our awareness are not things in the world but representations of those things, constructed by the visual systems in our brains. If the representations are inaccurate in capturing properties such as location, size, or shape, we quite literally see a scene different from what is actually before us. There is more to seeing than meets the eye. The Johns Hopkins University.