What part of the brain is deteriorating if a patient with alzheimer's disease is experiencing hallucinations?

Alzheimer's: The main problem occurs in the brain cortex of the temporal and parietal lobes. Commonly present perceptual disturbances and visuospatial disorientation. Auditory or visual hallucinations are not common. They do occur. May indicate a temporal or occipital lobe dysfunction. Conditions like diffuse lewy body dementia affect the occipital cortex causing prominent visual hallucinations.

Brain injury: Alzheimer's affects just about every part of the brain the areas more severely affected are the frontal and temporal lobes, areas where the hallucinations can come from.

Actually diffuse: Hallucinations, generically are consequence of dyscommunication in temporal and occipital circuits, but may also be secondary to several medications, which elderly may take.