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.
Integrative agnosia
Integrative agnosia is a sub-disease of agnosia, meaning the lack of integrating perceptual wholes within 
knowledge. Integrative agnosia can be assessed by several experimental tests such as the Efron shape test, which 
determines the specificity of the disease being Integrative. 
This disease is often caused by brain trauma, producing medial ventral lesions to the extrastriate cortex. Affecting this region of the brain produces learning impairments: the inability to 
integrate parts such as spatial distances or producing visual images from short or long-term memory.