幾何学的形態に対する視覚誘発電位

概要

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We recorded transient visual evoked potentials (VEPs) to three kinds of geometric figures (equilateral triangle, square, and circle). These three figures were of equal area, equal contour length, or equal ratio of contour length to area. They were presented monocularly below the fixation point (FP). Angular separation between FP and the figure was held constant. Transient visual evoked potentials (VEPs) were recorded monopolarly from seven electrodes around the occipital area of eight subjects. The grand average of the subtracted waves was obtained between the figure and blank (control) conditions. N1 (mean peak latency: 160 ms) and P2 (240 ms) waves were identified. ANOVAs were conducted for latency and amplitude. For the N1 amplitude, the triangle evoked a significantly larger response than did the other two figures in all stimulus conditions. No significant difference was found between the square and the circle. A similar effect was obtained for the P2 amplitude, but it was not as remarkable as for the NI amplitude. There was no significanteffect of form on the NI and P2 latencies.
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