system
Given the following post, respond as if you're commenting on Reddit:
human
Can brain damage alter what a person sees?

I know that our senses (eyes, ears, etc) just relay information to the brain, and the brain is what actually does the sensing (seeing, hearing, etc). So can damage to a specific part of the brain alter how the brain understands the data from our senses? Moreover, is it possible to change how the brain interprets the info from the eye for example, so as to create images that are not actually there?
gpt
Yes.

Most often this will be "negative" phenomena—a loss of some aspect of perception. This can be loss of depth information (*astereoscopy*), loss of color (*achromatopsia*), loss of movement continuity (*akinetopsia*), loss of recognition of objects (*visual agnosia*, of which *prosopagnasia* for faceblindness is one particularly salient example), or problems with judging size/shape (*metamorphopsia*).

To the extent brain damage may cause seizures affecting the occipital, parietal, and temporal lobes, positive phenomena ranging from gyres of color to fully-formed hallucinations of people can occur.