How does agnosia affect the brain?
Agnosia
Agnosia only affects a single modality,[3] such as vision or hearing
Agnosia is the inability to process sensory information. Often there is a loss of ability to recognize objects, persons, sounds, shapes, or smells while the specific sense is not defective nor is there any significant memory loss.[1] It is usually associated with brain injury or neurological illness, particularly after damage to the occipitotemporal border, which is part of the ventral stream.[2]  Agnosia only affects a single modality,[3] such as vision or hearing.[4] More recently, a top-down interruption is considered to cause the disturbance of handling perceptual information.[5]