Measurement of field-forces in visual perception by flicker method

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  • フリッカー法による形の場の強さの測定
  • フリッカーホウ ニ ヨル カタチ ノ バ ノ ツヨサ ノ ソクテイ

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Up to the present time, the effect of the figure on its ground has been measured by various methods. For instance, Yokose and Uchiyama used the light-stimulus-threshold method and formulated the integral equation from their experimental results showing the field-force of figures. They intended to develop a field theory of perception. However, further facts are necessary to establish the field theory of the perception of figures firmly. This investigation studies the effect of the figure on its ground by the use of flicker method.<BR>Procedures- we presented a light-figure to the subject in the dark room and projected a flickering point on the ground of the figure and measured the c. f. f. of the flickering point. The c. f. f. was measured under a variety of stimulus condition : circle, rectangle, triangle, straight line and so on were used as stimulus figures, the distance from the figure to the test point and the light intensity of figures were changed.<BR>Result- The effect of the figure on the c. f. f. of the flickering point was as follows :<BR>(1) The effect decreased with the increase in the distance between the figure and the test point. And the effect of the minute area of the figure seemed to be in inverse proportion to the square of distance.<BR>(2) The disposition of the effect around the figure depended on the structural character of the figure.<BR>(3) The effect increased with the increase in the light intensity of the figure within certain limits.<BR>And the experimental curves obtained under various conditions showed the tendency considerably similar to the theoretical curves obtained from Yokose's theoretical formula and Uchiyama's empirical formula under the same conditions.<BR>

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