title: Interhemispheric transfer of spatial and semantic information: electrophysiological evidence.
abstract: The goal of this study was to cast light on the existence of functional callosal channels for the interhemispheric transfer (IHT) of spatial and semantic information. To do so, we recorded event-related potentials in healthy humans while performing a primed odd-even discrimination task. Targets were visually presented numbers preceded by single-letter primes signaling the probable presentation of an odd or an even number. Primes and targets could appear either in the same or in different visual fields, thus requiring an IHT in the latter case. The P1 and N2 components were influenced by IHT of spatial information only, whereas the later N400 was influenced by IHT of both spatial and semantic information. This was not the case for the P3b, which was modulated by semantic validity only. These results provide novel evidence of the existence of a temporally separated interhemispheric exchange of spatial and semantic information.
authors: Department of Neuroscience, University of Verona, Verona, Italy.
authors: Anna
authors: A
authors: Dal Molin
authors: Carlo Alberto
authors: CA
authors: Marzi
authors: Marie T
authors: MT
authors: Banich
authors: Massimo
authors: M
authors: Girelli
mesh_terms: D001921:Brain / Q000502:physiology*; D004569:Electroencephalography; D004585:Electrooculography; D055724:Electrophysiological Phenomena; D018913:Event-Related Potentials, P300 / Q000502:physiology; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology; D012660:Semantics; D013028:Space Perception / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology; D055815:Young Adult