Effects of Multimodal Load on Spatial Monitoring as Revealed by ERPs

摘要: While the role of selective attention in filtering out irrelevant information has been extensively studied, its characteristics and neural underpinnings when multiple environmental stimuli have to be processed parallel are much less known. Building upon a dual-task paradigm that induced spatial awareness deficits for contralesional hemispace right hemisphere-damaged patients, we investigated electrophysiological correlates multimodal load during monitoring healthy participants. The position appearance briefly presented, lateralized targets had reported either isolation (single task) or together with concurrent task, visual auditory, which recruited additional attentional resources (dual-task). This top-down manipulation load, without any change sensory stimulation, modulated amplitude first positive ERP response (P1) shifted generators, suppression signal early areas both auditory dual tasks. Furthermore, later N2 contralateral components elicited by left were particularly influenced task related increased activation supramarginal gyrus. These results suggest hemisphere is affected manipulations, confirm crucial subtending automatic orienting hemispaces.