Development of a view-invariant representation of the human head.
Do infants perceive visual cues as diverse as frontal-view faces, profiles or bodies as being different aspects of the same object, a fellow human? If that is the case, visual exposure to one such cue should facilitate the subsequent processing of the others. To verify this hypothesis, we recorded event-related responses in 4-month-old infants and in adults. Pictures of eyes were interleaved amongst images belonging to three human contexts (frontal-view faces, profiles or bodies) or non-human contexts (houses, cars or pliers). In adults, both profile and frontal-face contexts elicited suppression of the N170 response to eye pictures, indicating an access to a view-invariant representation of faces. In infants, a response suppression of the N290 component was recorded only in the context of frontal faces, while profile context induces a different effect (i.e., a P400 enhancement) on eye processing. This dissociation suggests that the view-invariant representation of faces is learned, as it is for other 3-D objects and needs more than 4 months of exposure to be established. In a follow-up study, where infants were exposed to a short movie showing people rotating their heads, the profile-induced P400 effect was speeded up, indicating that exposure to successive views of the same object is probably a way to build up adult-like face representations.
Gliga
Teodora
T
CNRS, Unité INSERM 562, Service Hospitalier Frédéric Joliot, CEA/DRM/DSV, 4 Place du Général Leclerc, 91401 Orsay Cedex, France. gliga@clipper.ens.fr
Dehaene-Lambertz
Ghislaine
G
D001921:Brain / Q000502:physiology; D003463:Cues; D005071:Evoked Potentials / Q000502:physiology; D005145:Face; D006257:Head; D006801:Humans; D007223:Infant; D011930:Reaction Time; D014796:Visual Perception