Apperceptive agnosia
Each patient that suffers from apperceptive agnosia does not have brain damage in exactly the same area. However, brain damage in proximity to the occipital lobe is largely correlated with the patterns of deficit seen in apperceptive agnosics. For example, patient JB suffered extensive damage to the parietal-occipital areas to the left cerebral hemisphere leading to his deficit in the ability to name distinguish between structurally similar object.
Visual agnosia
The two main categories of visual agnosia are:Patient C.K. was born in 1961 in England and emigrated to Canada in 1980. In January of 1988, C.K. sustained a head injury from a motor vehicle accident while out for a jog. Following the accident, C.K. experienced many cognitive issues, mood swings, poor memory, and temper outbursts. C.K. also had motor weakness on the left side and a left homonymous hemianopia. He recovered well, retaining normal intelligence and normal visual acuity. He was able to complete a Masters in History, later working as a manager at a large corporation. Although his recovery was successful in other areas of cognition, C.K. still struggles to make sense of the visual world.