<Article>Effects of the Different Forms of Isosceles Triangles, the Square and the Circleon Visual Evoked Potentials

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Following the studies of Ito (1993) and Ito and Sugata (1995), in which equilateral triangle elicited larger N1 response compared to square and circle at the lower visual field, we examined the effects of isosceles triangles with different angularities of the vertex (30°, 60°, 90°, 120° and 150°), square and circle for eight subjecs. Triangles were presented in the upright and inverted orientations. VEPs were recorded monopolarly on the midline of scalp. Subtracted waves were obtained between figure and control (blank) conditions. N1 (peak latency: 125-140ms) and P2 (230-245ms) waves were identified. As main results, N1 amplitudes for triangles in the upright orientation tended to decrease as a function of angularity. Acute-angled triangles were of significantly greater N1 responses than square and circle. No significant differences were found between obtuse-angled triangles, square and circle. In the inverted orientation, N1 amplitudes for triangles showed the same tendency as in the upright orientation, being much less distinct. These findings suggest that the N1 increase for equilateral triangle is due to three acute angularities of triangle. The equilateral triangle could be considered as a fundamental form of triangles having such stimulus properties.
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