Face Recognition: Impairments in Prosopagnosia

1945 WordsOct 22, 20098 Pages
Face Recognition: Impairments in Prosopagnosia Prosopagnosia, also called face blindness, is a neuropsychological condition that refers to impairment in the recognition of faces. Although prosopagnosic patients suffer from other types of recognition impairments (place recognition, car recognition, facial expression of emotion, est.), they experience face recognition problems above or over other types impairments. Prosopagnosia occurs without intellectual, sensory or cognitive impairments; in other words, people with prosopagnosia can still recognize people from non-facial cues. They cannot recognize familiar people by their faces alone, and often use alternative routes to alleviate the effects of this impairment. These routes include…show more content…
This double dissociation therefore suggests that recognition of faces and common objects is served by different mechanisms that are independent for each other. Although brain cells of face recognition have not been located, some functional models could help us interpret face recognition and prosopagnosia. One of the most influential models was proposed by Bruce and Young (1986). In this model face recognition involves several steps, and three steps more relate to prosopagnosia. Firstly, structural encoding includes view-centred descriptions and expressionindependent descriptions. View-centred descriptions derive from visual input and provide information for expression analysis, facial speech analysis, and directed visual processing. To recognize an individual by the face, view-centred descriptions have to translate into expressionindependent descriptions those in turn active face recognition units. Some people with prosopagnosia may be due to impaired structural encoding for faces, and they show failure in perceptual face processing tasks. In fact, they are unable to make any sense of faces (eg. age or gender) and judge whether two faces are same. Secondly, face recognition units contain stored descriptions of known faces. When a familiar face is seen, face recognition units send signals to cognitive system and active person identity nodes. Person identity nodes allow access to semantic information about the person. The impairment

More about Face Recognition: Impairments in Prosopagnosia

Open Document