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Electrophysiological correlates of attention-spreading in visual grouping

This study examined event-related potentials in a sustained-attention task that involved bilateral stimulus arrays, which were connected or unconnected by a line. Spatial attention was reflected by a large amplitude of posterior event-related potentials at the hemisphere contralateral, rather than ipsilateral, to the attended hemi-field. The earliest attention effect (P1, 100–160 ms poststimulus) was not affected by connectedness. The subsequent attention effect (N2pc, 190–300 ms) was observed when the target feature appeared in the attended hemi-field, whereas this effect was not seen in the early phase (190–250 ms) in the connected condition. The results indicate that the lateralized event-related potential reflects transient attention-spreading in association with perceptual grouping.