Electrophysiological studies of face processing in developmental prosopagnosia: neuropsychological and neurodevelopmental perspectives.
People with developmental prosopagnosia (DP) show severe face-recognition deficits that typically emerge during childhood without history of neurological damage. We review findings from recent event-related brain potential (ERP) studies of face perception and face recognition in DP. The generic face-sensitivity of the N170 component is present in most DPs, suggesting rapid category-selective streaming of facial information. In contrast, DPs show atypical N170 face inversion effects, indicative of impaired structural encoding, specifically for upright faces. In line with neurodevelopmental accounts of DP, these effects are similar to those observed for other developmental disorders, as well as for younger children and older adults. Identity-sensitive ERP components (N250, P600f) triggered during successful face recognition are similar for DPs and control participants, indicating that the same mechanisms are active in both groups. The presence of covert face-recognition effects for the N250 component suggests that visual face memory and semantic memory can become disconnected in some individuals with DP. The implications of these results for neuropsychological and neurodevelopmental perspectives on DP are discussed.
Department of Psychological Sciences, Birkbeck College, University of London, UK.
John
J
Towler
Martin
M
Eimer
D001921:Brain / Q000503:physiopathology*; D004569:Electroencephalography; D005074:Evoked Potentials, Visual / Q000502:physiology*; D059907:Functional Neuroimaging; D006801:Humans; D008279:Magnetic Resonance Imaging; D010364:Pattern Recognition, Visual / Q000502:physiology*; D020238:Prosopagnosia / Q000151:congenital* / Q000503:physiopathology; D021641:Recognition, Psychology / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology