What is "prosopamnesia"

n. A rare neuropsychological deficit defined by an inability to remember faces.

Prosopamnesia (Greek: προσωπον = "face", αμνησια = forgetfulness) is a selective neurological impairment in the ability to learn new faces. There is a special neural circuit for the processing of faces as opposed to other non-face objects. Prosopamnesia is a deficit in the part of this circuit responsible for encoding perceptions as memories.