Abstract
The temporal factor plays an important role in visual phenomena. We should analyse, accordingly, not only the spatial but temporal conditions which produce the phenomena.
Having constructed the growing and declining process of the psycho-physical field, corresponding to visual phenomena, we have tried to throw light upon various phenomena not only in thesimultaneous but alsoin the succesive space.
In this study, we try to make clear how the perceived length of a line and the size of a surface figure are changed by varying the stimulating time. We do not expect they become shorter or smaller simply in proporiton to the amount of stimulating time, but they correspond to the forming process of the field.
As we expected, the following exprimental results were obtained :
1) The perceived length of a line is unaderstimated when the line was exposed for a short time but the underestimation rate decreases as the stimulating time increase.
2) The gradient of its change is steep at first, and then become slight gradually.
3) When the stimulating time is 5 or 10 seconds, the underestimation rate beecomes zero. The overstimation occurs with a further increase of time.
4) The greater the stimulus intensity is, the greater the understimation rate is.
5) Under the condition of the reduced stimulus intensity, the rate stops with 1 of 2 seconds and seems to be near zero.
6) The perceived size of a square is similar to that of a line.
7) But as its stimulus intensity is less than that of a line, the understimation rate becmes zero and even overstimation occurs when the stimulating time is as less as 2 or 5 seconds.
8) We found overstimations in both lines and squares, but their amount was too little. This problem will be further analyzed in the following paper.
It is very interesting that the growing process of visual phenomena which was shown to correspond to the forming process of the psycho-physical field. And it is full of suggestions to develop the field-theoretical study of visual phenomena.
