分割錯視に関する実験的研究

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It has been well-known that a spatial distance which is divided is overestimated than an undivided one. This phenomenon has been called by the name of "Divided Distance Illusion". And it has been investigated by many psychologists using Oppel's figures, Helmholtz's figures, Hering's figures, etc. Especially, the experimental analysis using stimulus figures consisted of four vertical lines has frequently been done. In each of those situations, the horizontal distance between two outer lines was divided by two inner lines, and an amount of illusion was measured as a magnitude of overestimation of the distance between two outer lines (outer distance). The present experiment was done to investigate the effect of length of dividing (inner) lines (I) upon the amount of illusion, and the effect of change of distance between two inner lines (d) upon the locational shift of maximal value of the amount of illusion. In these experimental situations, outer distances were held constant, and inner distances (d) were varied. PSE's of the apparent length of the outer distances were calculated from the data by the method of limits, and averages were calculated per single subject and per each experimental condition. And these PSE's were subtracted from an average of PSE of the control condition, respectively. Thus the amount of illusion was acquired. From the analysis of the PSE's in each experimental conditions through the technique of analysis of variance, several findings were obtained. And these were summarized as follows: (1) As for the divided illusion in the horizontal direction, magnitudes of overestimation of the outer distances varied unimodally with an increase of the inner distances in several conditions. But it was only under two conditions that facts obtained above were certified with statistical significance. And in those conditions where the I's were 10 mm and 20 mm respectively, the facts that the amount of illusion was maximum at the point where the ratio of inner distance to outer one was 1 to 3, were established. In other conditions, locations of the maximal value were uncertain, or the changes of amount of illusion showed no statistically significant trends. (2) As for the effect of I's, there was highly significant difference between two conditions where I's were 20 mm and 40 mm, but there was no significant difference between two conditions where I's were 10 mm and 20 mm. (3) As for the illusion in the vertical direction, the trends of changes in the amount of illusion showed no consistency. (4) As for the effect of I's, there were the same tendencies, with some exceptions, in the vertical direction as in the horizontal direction mentioned above.
奈良学芸大学の論文
1963-02-00

分割錯視に関する実験的研究

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奈良学芸大学 | 論文

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