The Oscar-winning actor is certain he has prosopagnosia, a condition whereby a person cannot recognise people's faces, though he remains undiagnosed. "Nobody believes me!" he sighed to GQ. "I wanna meet another." So, what exactly is prosopagnosia? The term refers to the cognitive disorder of face perception in which a person struggles to recognise faces, including one's own features.Dr Marianne Trent, clinical psychologist and founder of Good Thinking Psychological Services (goodthinkingpsychology.co.uk) explains that prosopagnosia has two causes - one developmental and one acquired.