We have known for some time that there is a double dissociation (I will define that term in a minute) between location and identification in the visual system. Neuroscientists speak of a "where" pathway that goes from the primary visual cortex in the occipital lobe up into the parietal lobe. Lesions to this pathway produce deficits in locating objects in space using vision. There is also a "what" pathway that goes from the primary visual cortex down into the temporal lobe. Lesions to...