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.
Glossary of psychiatry
Clouding of consciousness, also known as "brain fog" or "mental fog", is a global impairment in higher central nervous functioning. All aspects of cognitive functioning are affected. On mental status examination it is manifest by disorientation in time, place and person, memory difficulties caused by failure to register and recall, aphasia, and agnosia. Impaired perception functioning leads to illusions and hallucinations often in the visual sensory modality. This then causes agitation and distress and secondary delusions. The term 'confusion state' is sometimes used to mean clouding of consciousness, but should be avoided if at all possible because it is ambiguous.