Different Visual Features Processing Priority Of The Erp Study

The visual processing has been one of the hot topics in psychological studies, and there have been two different theories in this aspect. "The atom theory" supports that the visual processing starts from local, while "the overall theory" supports that the beginning of the visual processing is the whole. "Feature integration theory" and "topological perception theory" respectively represent above two theories. Chen Lin's "topological perception theory" thinks that visual processes from the entirety to part, topological characteristics are processed earlier than any other visual features. In this study, we use ERP technology, and analyze the visual MMN's peak latency, to explore the "topological perception theory".This study includes two experiments. Experiment 1 adopted two groups materials, one of which is different in topological and the other is different in color, to find whether the visual process the topological property is priority. Experiment 2 used two groups materials which different in area and the color, to find whether the visual process the shape property first. The findings are as follows:(1) Visual MMN existed, the characteristics of the visual MMN and the characteristics of the auditory MMN basically were same, but the brain distribution in the visual had the channel specificity.(2) Experiment 1 found: under non-attention condition, when standard stimulus and deviation stimulus were different in topological property, the visual MMN's peak latency appeared earlier; when standard stimulus and deviation stimulus were different in color, the visual MMN's peak latency appeared lately. It indicated the vision system first carries on the processing to the vision topological property under the non-attention condition, the result supported Chen Lin's "topological perception theory".(3) Experiment 2 found: under non-attention condition, compared to the condition that the standard stimulus and deviant stimuli were different in color, the condition of the standard stimulus and deviant stimuli were different in form (showed in the area) did not give significant changes of visual MMN's peak latencies. It showed that the form does not have priority processing. This provided complementary evidence to the "topological perception theory".