抄録
Some geometrical optical illusions are analyzed in terms of the perceptual field. Psychological distance is introduced which is different from physical distance, and this difference explains theillusion.
A theory is proposed which represents the psychological distance as a function of the field potential induced by the stimulus figure. By defining the psychological distance and line, the straight line and the length in the figure can be determined, and geometrical optical illusions cam be explained as distortions of the metric of the perceptual field.
