title: Ventral and dorsal pathways of speech perception: an intracerebral ERP study.
abstract: Recent theory of physiology of language suggests a dual stream dorsal/ventral organization of speech perception. Using intra-cerebral Event-related potentials (ERPs) during pre-surgical assessment of twelve drug-resistant epileptic patients, we aimed to single out electrophysiological patterns during both lexical-semantic and phonological monitoring tasks involving ventral and dorsal regions respectively. Phonological information processing predominantly occurred in the left supra-marginal gyrus (dorsal stream) and lexico-semantic information occurred in anterior/middle temporal and fusiform gyri (ventral stream). Similar latencies were identified in response to phonological and lexico-semantic tasks, suggesting parallel processing. Typical ERP components were strongly left lateralized since no evoked responses were recorded in homologous right structures. Finally, ERP patterns suggested the inferior frontal gyrus as the likely final common pathway of both dorsal and ventral streams. These results brought out detailed evidence of the spatial-temporal information processing in the dual pathways involved in speech perception.
authors.affiliation: INS INSERM, UMR 1106, 13005 Marseille, France; Aix Marseille Université, 13000 Marseille, France; Assistance Publique-Hôpitaux Marseille, 13005 Marseille, France. Electronic address: agnes.trebuchon@univ-amu.fr.
authors.forename: Agnès
authors.initials: A
authors.lastname: Trébuchon
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Démonet
authors.forename: Patrick
authors.initials: P
authors.lastname: Chauvel
authors.forename: Catherine
authors.initials: C
authors.lastname: Liégeois-Chauvel
mesh_terms: D000293:Adolescent; D000328:Adult; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009434:Neural Pathways / Q000502:physiology*; D012815:Signal Processing, Computer-Assisted; D013067:Speech Perception / Q000502:physiology*; D055815:Young Adult
keywords: Dorsal stream; ERP; Intracranial recordings; Speech perception; Ventral stream