I read a short story involving prosopagnosia (Wikipedia), which harms or fully removes a person's ability to remember and recognize faces, and I've since been doing reading to better understand the condition. The precise causes, as I understand it, are not well-known, although it is believed to be related to damage in the right fusiform gyrus:
Prosopagnosia is thought to be the result of abnormalities, damage, or impairment in the right fusiform gyrus, a fold in the brain that appears to coordinate the neural systems that control facial perception and memory.
As far as I'm aware, the fusiform gyrus has functions beyond facial recognition and analysis - although my knowledge of how facial recognition in the brain works is limited. Therefore, my naïve logic is that damage to the region should also damage other (related) mental abilities, yet I can't find much information about other disabilities prosopagnosiacs may face, if any.
If prosopagnosia does arise from damage to the fusiform gynus, why are the effects merely limited to facial perception? If the effects are not this limited, are there any minor disabilities associated with the condition?