 Prosopamnesiacs show a memory for facial stimuli that they learned prior to the onset of their condition (in the case of acquired prosopamnesia) or for facial stimuli that they have encountered repeatedly for long periods of time (in the case of congenital prosopamnesia).There are currently only two diagnosed cases of prosopamnesia.This is likely due to the fact that it can easily be misdiagnosed as prosopagnosia based on symptoms.