STUDY ON VISUAL SPATIAL ATTENTION EVENT RELATED POTENTIALS BASED ON SYNERGETICS ANALYSIS
视觉空间注意事件相关电位的协同学分析

It can be derived directly through observing the visual event-related potentials (ERP) data that the main function of spatial attention is the modulation of visual signal processing when the mechanism of visual spatial attention is investigated with ERP. The visual ERPs consisted of several characteristic voltage deflections emerging about 80 ms after the stimulus onset that include the P1 (80~130 ms), N1 (140~200 ms) and P2 (200~250 ms) components. Directing attention to the location of a stimulus typically results in an amplitude enhancement of the P1 and N1 components evoked by that stimulus with little or no change in component latencies or scalp distributions. The spatiotemporal signal decomposition based on synergetic was applied into visual ERP data analysis,three spatial modes were produced, and the results showed that attention not only enhanced the amplitude of the first positive component of mode1(P11), the first negative component of mode1(N11) and the second positive component of mode1 (P12) , but also shortened the latency of the first positive component of mode3(P31). The searchlight model is adopted here to make preliminary explanation for the results, it shows that the synergetic analysis is a promising method for investigating attention ERP.