 Prosopagnosia is a deficit that occurs earlier in the neural circuit while the facial stimuli is being processed, whereas prosopamnesia takes effect when the brain attempts to encode the processed facial stimuli into memory.Because the distinction between prosopamnesia and prosopagnosia is so close in the neurological circuit, the only phenotypic difference between the two is in the breadth of faces to which a patient's symptoms apply.Prosopagnosics cannot recognize faces, even of people within their own families over the span of a lifetime.