形の把捉態度による光覚閾値の変動に関する数量的研究
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概要
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It is not just the external stimulu-sconstellation characteristics such as the form, the brightness of the figure, and the distance from the figure to the point which influences the light threshold of a small test patch projected at various points inside a figure. In the compound figures whose appearance changes according to the subject's attitude in the grasping of the forms, it is also influenced by the attitude.Firstly with the three kinds of compound figures used, the changes of the light threshold values inside these figures were examined under a variety of the subject's attitudes.In Experiment I and II, the reversible figure-ground pattern of a large and a small concentric regular square (Fig. 2) was used and the following two kinds of attitudes were adopted. A1: S made an attempt to grasp the small square as the "figure", and A2: to grasp the space between both ones likewise.In Experiment III and IV, the reversible roof-shaped depth figure (Fig. 3) was used and the following two kinds of attitudes were adopted. A1:S made an attempt to grasp the left parallelogram as situated in the foreground, and A2: to grasp the right one likewise.In Experiment V and VI, where an overlapping figure consisting of a regular square and a regular triangle (Fig. 4) was used, the following three kinds of attitudes were adopted. A1:S made an attempt to grasp the square as the "figure", A2: to grasp the small overlapped triangle as such, and A3: to grasp the large triangle likewise.The results of these experiments (Table 1-6) seemed to ascertain evidence of some influence of the attitude on the light threshold. As for the results of Experiment V and VI (Table 5 and 6), the manner and the extent of the influence of the attitude on the light threshold was analyzed quantitatively according to Yokose's potential theory.The results of these quantitative analyses were as follows.(1) The changes of the light threshold values inside the compound figures were correlated to the weighted sums of potentials (the field strength) of its constituent forms.(2) The influence of the attitude was expressed as the weighting coefficients of potentials (Table 3 and 9).(3) The weighting coefficients of potentials of each form increased when it was grasped as the "figure".
- 公益社団法人 日本心理学会の論文