title: Developmental changes in neural activity to familiar words and gestures.
abstract: Infants younger than 20 months of age interpret both words and symbolic gestures as object names. Later in development words and gestures take on divergent communicative functions. Here, we examined patterns of brain activity to words and gestures in typically developing infants at 18 and 26 months of age. Event-related potentials (ERPs) were recorded during a match/mismatch task. At 18 months, an N400 mismatch effect was observed for pictures preceded by both words and gestures. At 26 months the N400 effect was limited to words. The results provide the first neurobiological evidence showing developmental changes in semantic processing of gestures.
authors.affiliation: Department of Psychology, Emory University, 532 N. Kilgo Circle, Atlanta, GA 30322, USA. elizabeth.sheehan@emory.edu
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Sheehan
authors.forename: Laura L
authors.initials: LL
authors.lastname: Namy
authors.forename: Debra L
authors.initials: DL
authors.lastname: Mills
mesh_terms: D001931:Brain Mapping; D002540:Cerebral Cortex / Q000502:physiology*; D002657:Child Development; D002675:Child, Preschool; D004292:Dominance, Cerebral; D005071:Evoked Potentials; D005260:Female; D005868:Gestures; D006801:Humans; D007223:Infant; D007804:Language Development; D008297:Male; D011578:Psycholinguistics; D011930:Reaction Time; D012660:Semantics; D013067:Speech Perception / Q000502:physiology*