Studies on eye movements and brain processes during a perceptual grouping task using random dot visual stimuli

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Perceptual grouping is a process involved in chunking visual information and in image segmentation, constituting an important aspect of visual processing. In order to investigate the neural activities related to perceptual grouping, we have measured event-related magnetic fields (ERFs) during the performance of a common fate grouping task. Distinct several ERF components were observed before the reaction time. The peak latency of the last ERF component observed in the prefrontal, temporal and parietal areas, which was 150~300 ms faster than the reaction time, varied with the reaction time. These findings suggest that the last ERF component observed in the frontal and parietal areas reflect the neural activities associated with common fate grouping.