Prosopagnosia isn't a biological issue. It's linked to a pathway in the brain...they just aren't certain yet which pathway it is. It was first discovered in stroke victims which is why the research is focused on the brain structures and electrical signals. Sometimes with stroke victims, there is hope that they will regain the ability to recognize faces as their brain heals from the trauma. In someone with congenital prosopagnosia, there currently isn't any prognosis for recovery because they believe the pathway that connects that information was just never formed.