Topographagnosia is most commonly attributed to an @entity1054 for landmarks. In order to define the nature of this @entity1054 , we studied a @entity1 with isolated @entity911 ( @entity911 ) after a @entity64 in the right medial occipitotemporal region. The @entity1 got lost in familiar environments but could readily read and draw maps, describe familiar routes, and provide correct directions. He had normal perceptual test performance and met criteria for topographagnosia rather than for other forms of @entity911 . Two ecologically valid route tests assessed the nature of his @entity1054 . On a familiar route, he could recognize major landmarks. He could not, however, recognize route configurations made up of combinations of visual features each lacking individual distinctiveness. On a test of route learning, he learned landmarks that differed in minor details and could use them to orient himself along a route. He had difficulty, however, recognizing and learning scenes lacking salient landmarks. This @entity1054 for scenes was worse for semantically-related environments, but improved with semantic knowledge such as street names. In addition, the @entity1 lacked overt prosopagnosia but tended toward semantic errors in the recognition of famous faces. Together these findings suggest that this @entity1 's inability to recognize a route resulted from an inability of intact perceptual units for scenes, composed of specific visual configurations of individually indefinite features, from accessing stored representations.

XXXX for scenes in topographagnosia.

@entity1 :: ('9606', 'Species') :: ['patient'] @entity64 :: ('MESH:D020521', 'Disease') :: ['stroke'] @entity1054 :: ('MESH:D000377', 'Disease') :: ['agnosia'] @entity911 :: ('MESH:D003221', 'Disease') :: ['TD', 'topographic disorientation']
@entity1054 :: (MESH:D000377,Disease) :: ['Agnosia']
