A Study on Coherence of ERP Evoked by Forn and Spatial Location Perception

Two methods, that is, 128-channel high temporal resolution electroencephalograms and coherence technology, were integrated to research the cognitive activation patterns in responding to the task of form perception (task1) and the task involving both form and spatial location perception (task2). Simultaneously, the scalp was divided into 7 regions from occipital to frontal; similar number electrodes were selected in each of them. Coherences, between occipital area and other areas, of different frequency band were calculated. The results indicated that the average coherence index of task 2 was significantly bigger than that of task 1 at band gamma1 (28-39 Hz). In addition, between occipital area and frontal area, the difference of coherence index between task 2 and task 1 was significantly bigger than between occipital area and others. Combined with two visual pathways theory, and coherence results, these data suggested that the participation of dorsal stream strengthen the information communication between occipital and frontal at band gamma1