Final answer:
Visual perceptual disorders result from different brain regions such as prosopagnosia and bilateral hemianopia. Visual processing occurs in two streams, the ventral stream and the dorsal stream.
Step-by-step explanation:
Visual perceptual disorders result from different brain regions. One example is prosopagnosia, also known as face blindness, which inhibits the recognition of faces. Another example is bilateral hemianopia, which is the loss of lateral peripheral vision due to a growth in the pituitary gland that presses against the optic chiasm. Additionally, visual processing occurs in two separate streams, the ventral stream in the temporal lobe that identifies visual stimuli, and the dorsal stream in the parietal lobe that locates objects in space and guides body movements in response to visual inputs.